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718e3744 | 1 | /* |
2 | * OSPF Sending and Receiving OSPF Packets. | |
3 | * Copyright (C) 1999, 2000 Toshiaki Takada | |
4 | * | |
5 | * This file is part of GNU Zebra. | |
6 | * | |
7 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2, or (at your option) any | |
10 | * later version. | |
11 | * | |
12 | * GNU Zebra is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with GNU Zebra; see the file COPYING. If not, write to the Free | |
19 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
20 | * 02111-1307, USA. | |
21 | */ | |
22 | ||
23 | #include <zebra.h> | |
24 | ||
25 | #include "thread.h" | |
26 | #include "memory.h" | |
27 | #include "linklist.h" | |
28 | #include "prefix.h" | |
29 | #include "if.h" | |
30 | #include "table.h" | |
31 | #include "sockunion.h" | |
32 | #include "stream.h" | |
33 | #include "log.h" | |
2dd8bb4e | 34 | #include "sockopt.h" |
484315fd | 35 | #include "checksum.h" |
c1a03d47 | 36 | #include "md5.h" |
718e3744 | 37 | |
38 | #include "ospfd/ospfd.h" | |
39 | #include "ospfd/ospf_network.h" | |
40 | #include "ospfd/ospf_interface.h" | |
41 | #include "ospfd/ospf_ism.h" | |
42 | #include "ospfd/ospf_asbr.h" | |
43 | #include "ospfd/ospf_lsa.h" | |
44 | #include "ospfd/ospf_lsdb.h" | |
45 | #include "ospfd/ospf_neighbor.h" | |
46 | #include "ospfd/ospf_nsm.h" | |
47 | #include "ospfd/ospf_packet.h" | |
48 | #include "ospfd/ospf_spf.h" | |
49 | #include "ospfd/ospf_flood.h" | |
50 | #include "ospfd/ospf_dump.h" | |
51 | ||
718e3744 | 52 | /* Packet Type String. */ |
eb1ce605 | 53 | const char *ospf_packet_type_str[] = |
718e3744 | 54 | { |
55 | "unknown", | |
56 | "Hello", | |
57 | "Database Description", | |
58 | "Link State Request", | |
59 | "Link State Update", | |
60 | "Link State Acknowledgment", | |
61 | }; | |
62 | ||
718e3744 | 63 | /* OSPF authentication checking function */ |
4dadc291 | 64 | static int |
718e3744 | 65 | ospf_auth_type (struct ospf_interface *oi) |
66 | { | |
67 | int auth_type; | |
68 | ||
69 | if (OSPF_IF_PARAM (oi, auth_type) == OSPF_AUTH_NOTSET) | |
70 | auth_type = oi->area->auth_type; | |
71 | else | |
72 | auth_type = OSPF_IF_PARAM (oi, auth_type); | |
73 | ||
74 | /* Handle case where MD5 key list is not configured aka Cisco */ | |
75 | if (auth_type == OSPF_AUTH_CRYPTOGRAPHIC && | |
76 | list_isempty (OSPF_IF_PARAM (oi, auth_crypt))) | |
77 | return OSPF_AUTH_NULL; | |
78 | ||
79 | return auth_type; | |
80 | ||
81 | } | |
82 | ||
718e3744 | 83 | struct ospf_packet * |
84 | ospf_packet_new (size_t size) | |
85 | { | |
86 | struct ospf_packet *new; | |
87 | ||
88 | new = XCALLOC (MTYPE_OSPF_PACKET, sizeof (struct ospf_packet)); | |
89 | new->s = stream_new (size); | |
90 | ||
91 | return new; | |
92 | } | |
93 | ||
94 | void | |
95 | ospf_packet_free (struct ospf_packet *op) | |
96 | { | |
97 | if (op->s) | |
98 | stream_free (op->s); | |
99 | ||
100 | XFREE (MTYPE_OSPF_PACKET, op); | |
101 | ||
102 | op = NULL; | |
103 | } | |
104 | ||
105 | struct ospf_fifo * | |
106 | ospf_fifo_new () | |
107 | { | |
108 | struct ospf_fifo *new; | |
109 | ||
110 | new = XCALLOC (MTYPE_OSPF_FIFO, sizeof (struct ospf_fifo)); | |
111 | return new; | |
112 | } | |
113 | ||
114 | /* Add new packet to fifo. */ | |
115 | void | |
116 | ospf_fifo_push (struct ospf_fifo *fifo, struct ospf_packet *op) | |
117 | { | |
118 | if (fifo->tail) | |
119 | fifo->tail->next = op; | |
120 | else | |
121 | fifo->head = op; | |
122 | ||
123 | fifo->tail = op; | |
124 | ||
125 | fifo->count++; | |
126 | } | |
127 | ||
128 | /* Delete first packet from fifo. */ | |
129 | struct ospf_packet * | |
130 | ospf_fifo_pop (struct ospf_fifo *fifo) | |
131 | { | |
132 | struct ospf_packet *op; | |
133 | ||
134 | op = fifo->head; | |
135 | ||
136 | if (op) | |
137 | { | |
138 | fifo->head = op->next; | |
139 | ||
140 | if (fifo->head == NULL) | |
141 | fifo->tail = NULL; | |
142 | ||
143 | fifo->count--; | |
144 | } | |
145 | ||
146 | return op; | |
147 | } | |
148 | ||
149 | /* Return first fifo entry. */ | |
150 | struct ospf_packet * | |
151 | ospf_fifo_head (struct ospf_fifo *fifo) | |
152 | { | |
153 | return fifo->head; | |
154 | } | |
155 | ||
156 | /* Flush ospf packet fifo. */ | |
157 | void | |
158 | ospf_fifo_flush (struct ospf_fifo *fifo) | |
159 | { | |
160 | struct ospf_packet *op; | |
161 | struct ospf_packet *next; | |
162 | ||
163 | for (op = fifo->head; op; op = next) | |
164 | { | |
165 | next = op->next; | |
166 | ospf_packet_free (op); | |
167 | } | |
168 | fifo->head = fifo->tail = NULL; | |
169 | fifo->count = 0; | |
170 | } | |
171 | ||
172 | /* Free ospf packet fifo. */ | |
173 | void | |
174 | ospf_fifo_free (struct ospf_fifo *fifo) | |
175 | { | |
176 | ospf_fifo_flush (fifo); | |
177 | ||
178 | XFREE (MTYPE_OSPF_FIFO, fifo); | |
179 | } | |
180 | ||
181 | void | |
182 | ospf_packet_add (struct ospf_interface *oi, struct ospf_packet *op) | |
183 | { | |
c3eab871 | 184 | if (!oi->obuf) |
185 | { | |
186 | zlog_err("ospf_packet_add(interface %s in state %d [%s], packet type %s, " | |
187 | "destination %s) called with NULL obuf, ignoring " | |
188 | "(please report this bug)!\n", | |
189 | IF_NAME(oi), oi->state, LOOKUP (ospf_ism_state_msg, oi->state), | |
190 | ospf_packet_type_str[stream_getc_from(op->s, 1)], | |
191 | inet_ntoa (op->dst)); | |
192 | return; | |
193 | } | |
194 | ||
718e3744 | 195 | /* Add packet to end of queue. */ |
196 | ospf_fifo_push (oi->obuf, op); | |
197 | ||
198 | /* Debug of packet fifo*/ | |
199 | /* ospf_fifo_debug (oi->obuf); */ | |
200 | } | |
201 | ||
202 | void | |
203 | ospf_packet_delete (struct ospf_interface *oi) | |
204 | { | |
205 | struct ospf_packet *op; | |
206 | ||
207 | op = ospf_fifo_pop (oi->obuf); | |
208 | ||
209 | if (op) | |
210 | ospf_packet_free (op); | |
211 | } | |
212 | ||
718e3744 | 213 | struct ospf_packet * |
214 | ospf_packet_dup (struct ospf_packet *op) | |
215 | { | |
216 | struct ospf_packet *new; | |
217 | ||
37163d6d | 218 | if (stream_get_endp(op->s) != op->length) |
219 | zlog_warn ("ospf_packet_dup stream %ld ospf_packet %d size mismatch", | |
30961a15 | 220 | STREAM_SIZE(op->s), op->length); |
30961a15 | 221 | |
222 | /* Reserve space for MD5 authentication that may be added later. */ | |
223 | new = ospf_packet_new (stream_get_endp(op->s) + OSPF_AUTH_MD5_SIZE); | |
fa81b713 | 224 | stream_copy (new->s, op->s); |
718e3744 | 225 | |
226 | new->dst = op->dst; | |
227 | new->length = op->length; | |
228 | ||
229 | return new; | |
230 | } | |
231 | ||
86f1fd96 | 232 | /* XXX inline */ |
4dadc291 | 233 | static inline unsigned int |
86f1fd96 | 234 | ospf_packet_authspace (struct ospf_interface *oi) |
235 | { | |
236 | int auth = 0; | |
237 | ||
238 | if ( ospf_auth_type (oi) == OSPF_AUTH_CRYPTOGRAPHIC) | |
239 | auth = OSPF_AUTH_MD5_SIZE; | |
240 | ||
241 | return auth; | |
242 | } | |
243 | ||
4dadc291 | 244 | static unsigned int |
718e3744 | 245 | ospf_packet_max (struct ospf_interface *oi) |
246 | { | |
247 | int max; | |
248 | ||
86f1fd96 | 249 | max = oi->ifp->mtu - ospf_packet_authspace(oi); |
250 | ||
68b7339a | 251 | max -= (OSPF_HEADER_SIZE + sizeof (struct ip)); |
718e3744 | 252 | |
253 | return max; | |
254 | } | |
255 | ||
256 | \f | |
4dadc291 | 257 | static int |
718e3744 | 258 | ospf_check_md5_digest (struct ospf_interface *oi, struct stream *s, |
259 | u_int16_t length) | |
260 | { | |
6c835671 | 261 | unsigned char *ibuf; |
c1a03d47 | 262 | MD5_CTX ctx; |
718e3744 | 263 | unsigned char digest[OSPF_AUTH_MD5_SIZE]; |
264 | unsigned char *pdigest; | |
265 | struct crypt_key *ck; | |
266 | struct ospf_header *ospfh; | |
267 | struct ospf_neighbor *nbr; | |
268 | ||
269 | ||
270 | ibuf = STREAM_PNT (s); | |
271 | ospfh = (struct ospf_header *) ibuf; | |
272 | ||
273 | /* Get pointer to the end of the packet. */ | |
274 | pdigest = ibuf + length; | |
275 | ||
276 | /* Get secret key. */ | |
277 | ck = ospf_crypt_key_lookup (OSPF_IF_PARAM (oi, auth_crypt), | |
278 | ospfh->u.crypt.key_id); | |
279 | if (ck == NULL) | |
280 | { | |
281 | zlog_warn ("interface %s: ospf_check_md5 no key %d", | |
282 | IF_NAME (oi), ospfh->u.crypt.key_id); | |
283 | return 0; | |
284 | } | |
285 | ||
286 | /* check crypto seqnum. */ | |
287 | nbr = ospf_nbr_lookup_by_routerid (oi->nbrs, &ospfh->router_id); | |
288 | ||
289 | if (nbr && ntohl(nbr->crypt_seqnum) > ntohl(ospfh->u.crypt.crypt_seqnum)) | |
290 | { | |
291 | zlog_warn ("interface %s: ospf_check_md5 bad sequence %d (expect %d)", | |
292 | IF_NAME (oi), | |
293 | ntohl(ospfh->u.crypt.crypt_seqnum), | |
294 | ntohl(nbr->crypt_seqnum)); | |
295 | return 0; | |
296 | } | |
297 | ||
298 | /* Generate a digest for the ospf packet - their digest + our digest. */ | |
c1a03d47 | 299 | memset(&ctx, 0, sizeof(ctx)); |
300 | MD5Init(&ctx); | |
301 | MD5Update(&ctx, ibuf, length); | |
302 | MD5Update(&ctx, ck->auth_key, OSPF_AUTH_MD5_SIZE); | |
303 | MD5Final(digest, &ctx); | |
718e3744 | 304 | |
305 | /* compare the two */ | |
306 | if (memcmp (pdigest, digest, OSPF_AUTH_MD5_SIZE)) | |
307 | { | |
308 | zlog_warn ("interface %s: ospf_check_md5 checksum mismatch", | |
309 | IF_NAME (oi)); | |
310 | return 0; | |
311 | } | |
312 | ||
313 | /* save neighbor's crypt_seqnum */ | |
314 | if (nbr) | |
315 | nbr->crypt_seqnum = ospfh->u.crypt.crypt_seqnum; | |
316 | return 1; | |
317 | } | |
318 | ||
319 | /* This function is called from ospf_write(), it will detect the | |
320 | authentication scheme and if it is MD5, it will change the sequence | |
321 | and update the MD5 digest. */ | |
4dadc291 | 322 | static int |
718e3744 | 323 | ospf_make_md5_digest (struct ospf_interface *oi, struct ospf_packet *op) |
324 | { | |
325 | struct ospf_header *ospfh; | |
326 | unsigned char digest[OSPF_AUTH_MD5_SIZE]; | |
c1a03d47 | 327 | MD5_CTX ctx; |
718e3744 | 328 | void *ibuf; |
9483e155 | 329 | u_int32_t t; |
718e3744 | 330 | struct crypt_key *ck; |
3623814a | 331 | const u_int8_t *auth_key; |
718e3744 | 332 | |
333 | ibuf = STREAM_DATA (op->s); | |
334 | ospfh = (struct ospf_header *) ibuf; | |
335 | ||
336 | if (ntohs (ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
337 | return 0; | |
338 | ||
339 | /* We do this here so when we dup a packet, we don't have to | |
340 | waste CPU rewriting other headers. */ | |
9483e155 | 341 | t = (time(NULL) & 0xFFFFFFFF); |
818e56cf | 342 | if (t > oi->crypt_seqnum) |
343 | oi->crypt_seqnum = t; | |
344 | else | |
345 | oi->crypt_seqnum++; | |
346 | ||
9483e155 | 347 | ospfh->u.crypt.crypt_seqnum = htonl (oi->crypt_seqnum); |
718e3744 | 348 | |
349 | /* Get MD5 Authentication key from auth_key list. */ | |
350 | if (list_isempty (OSPF_IF_PARAM (oi, auth_crypt))) | |
3623814a | 351 | auth_key = (const u_int8_t *) ""; |
718e3744 | 352 | else |
353 | { | |
1eb8ef25 | 354 | ck = listgetdata (listtail(OSPF_IF_PARAM (oi, auth_crypt))); |
4dadc291 | 355 | auth_key = ck->auth_key; |
718e3744 | 356 | } |
357 | ||
358 | /* Generate a digest for the entire packet + our secret key. */ | |
c1a03d47 | 359 | memset(&ctx, 0, sizeof(ctx)); |
360 | MD5Init(&ctx); | |
361 | MD5Update(&ctx, ibuf, ntohs (ospfh->length)); | |
362 | MD5Update(&ctx, auth_key, OSPF_AUTH_MD5_SIZE); | |
363 | MD5Final(digest, &ctx); | |
718e3744 | 364 | |
365 | /* Append md5 digest to the end of the stream. */ | |
718e3744 | 366 | stream_put (op->s, digest, OSPF_AUTH_MD5_SIZE); |
718e3744 | 367 | |
368 | /* We do *NOT* increment the OSPF header length. */ | |
30961a15 | 369 | op->length = ntohs (ospfh->length) + OSPF_AUTH_MD5_SIZE; |
370 | ||
37163d6d | 371 | if (stream_get_endp(op->s) != op->length) |
372 | zlog_warn("ospf_make_md5_digest: length mismatch stream %ld ospf_packet %d", stream_get_endp(op->s), op->length); | |
718e3744 | 373 | |
374 | return OSPF_AUTH_MD5_SIZE; | |
375 | } | |
376 | ||
377 | \f | |
4dadc291 | 378 | static int |
718e3744 | 379 | ospf_ls_req_timer (struct thread *thread) |
380 | { | |
381 | struct ospf_neighbor *nbr; | |
382 | ||
383 | nbr = THREAD_ARG (thread); | |
384 | nbr->t_ls_req = NULL; | |
385 | ||
386 | /* Send Link State Request. */ | |
387 | if (ospf_ls_request_count (nbr)) | |
388 | ospf_ls_req_send (nbr); | |
389 | ||
390 | /* Set Link State Request retransmission timer. */ | |
391 | OSPF_NSM_TIMER_ON (nbr->t_ls_req, ospf_ls_req_timer, nbr->v_ls_req); | |
392 | ||
393 | return 0; | |
394 | } | |
395 | ||
396 | void | |
397 | ospf_ls_req_event (struct ospf_neighbor *nbr) | |
398 | { | |
399 | if (nbr->t_ls_req) | |
400 | { | |
401 | thread_cancel (nbr->t_ls_req); | |
402 | nbr->t_ls_req = NULL; | |
403 | } | |
404 | nbr->t_ls_req = thread_add_event (master, ospf_ls_req_timer, nbr, 0); | |
405 | } | |
406 | ||
407 | /* Cyclic timer function. Fist registered in ospf_nbr_new () in | |
408 | ospf_neighbor.c */ | |
409 | int | |
410 | ospf_ls_upd_timer (struct thread *thread) | |
411 | { | |
412 | struct ospf_neighbor *nbr; | |
413 | ||
414 | nbr = THREAD_ARG (thread); | |
415 | nbr->t_ls_upd = NULL; | |
416 | ||
417 | /* Send Link State Update. */ | |
418 | if (ospf_ls_retransmit_count (nbr) > 0) | |
419 | { | |
52dc7ee6 | 420 | struct list *update; |
718e3744 | 421 | struct ospf_lsdb *lsdb; |
422 | int i; | |
718e3744 | 423 | int retransmit_interval; |
424 | ||
718e3744 | 425 | retransmit_interval = OSPF_IF_PARAM (nbr->oi, retransmit_interval); |
426 | ||
427 | lsdb = &nbr->ls_rxmt; | |
428 | update = list_new (); | |
429 | ||
430 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) | |
431 | { | |
432 | struct route_table *table = lsdb->type[i].db; | |
433 | struct route_node *rn; | |
434 | ||
435 | for (rn = route_top (table); rn; rn = route_next (rn)) | |
436 | { | |
437 | struct ospf_lsa *lsa; | |
438 | ||
439 | if ((lsa = rn->info) != NULL) | |
440 | /* Don't retransmit an LSA if we received it within | |
441 | the last RxmtInterval seconds - this is to allow the | |
442 | neighbour a chance to acknowledge the LSA as it may | |
443 | have ben just received before the retransmit timer | |
444 | fired. This is a small tweak to what is in the RFC, | |
445 | but it will cut out out a lot of retransmit traffic | |
446 | - MAG */ | |
d24f6e2a | 447 | if (tv_cmp (tv_sub (recent_time, lsa->tv_recv), |
718e3744 | 448 | int2tv (retransmit_interval)) >= 0) |
449 | listnode_add (update, rn->info); | |
450 | } | |
451 | } | |
452 | ||
453 | if (listcount (update) > 0) | |
454 | ospf_ls_upd_send (nbr, update, OSPF_SEND_PACKET_DIRECT); | |
455 | list_delete (update); | |
456 | } | |
457 | ||
458 | /* Set LS Update retransmission timer. */ | |
459 | OSPF_NSM_TIMER_ON (nbr->t_ls_upd, ospf_ls_upd_timer, nbr->v_ls_upd); | |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
464 | int | |
465 | ospf_ls_ack_timer (struct thread *thread) | |
466 | { | |
467 | struct ospf_interface *oi; | |
468 | ||
469 | oi = THREAD_ARG (thread); | |
470 | oi->t_ls_ack = NULL; | |
471 | ||
472 | /* Send Link State Acknowledgment. */ | |
473 | if (listcount (oi->ls_ack) > 0) | |
474 | ospf_ls_ack_send_delayed (oi); | |
475 | ||
476 | /* Set LS Ack timer. */ | |
477 | OSPF_ISM_TIMER_ON (oi->t_ls_ack, ospf_ls_ack_timer, oi->v_ls_ack); | |
478 | ||
479 | return 0; | |
480 | } | |
481 | ||
0bfeca3f | 482 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
5dcbdf82 | 483 | static void |
6a99f831 | 484 | ospf_write_frags (int fd, struct ospf_packet *op, struct ip *iph, |
62d8e96a | 485 | struct msghdr *msg, unsigned int maxdatasize, |
37ccfa3d | 486 | unsigned int mtu, int flags, u_char type) |
0bfeca3f | 487 | { |
488 | #define OSPF_WRITE_FRAG_SHIFT 3 | |
6a99f831 | 489 | u_int16_t offset; |
62d8e96a | 490 | struct iovec *iovp; |
6a99f831 | 491 | int ret; |
0bfeca3f | 492 | |
493 | assert ( op->length == stream_get_endp(op->s) ); | |
62d8e96a | 494 | assert (msg->msg_iovlen == 2); |
0bfeca3f | 495 | |
496 | /* we can but try. | |
497 | * | |
498 | * SunOS, BSD and BSD derived kernels likely will clear ip_id, as | |
499 | * well as the IP_MF flag, making this all quite pointless. | |
500 | * | |
501 | * However, for a system on which IP_MF is left alone, and ip_id left | |
502 | * alone or else which sets same ip_id for each fragment this might | |
503 | * work, eg linux. | |
504 | * | |
505 | * XXX-TODO: It would be much nicer to have the kernel's use their | |
506 | * existing fragmentation support to do this for us. Bugs/RFEs need to | |
507 | * be raised against the various kernels. | |
508 | */ | |
509 | ||
510 | /* set More Frag */ | |
511 | iph->ip_off |= IP_MF; | |
512 | ||
513 | /* ip frag offset is expressed in units of 8byte words */ | |
514 | offset = maxdatasize >> OSPF_WRITE_FRAG_SHIFT; | |
515 | ||
62d8e96a | 516 | iovp = &msg->msg_iov[1]; |
517 | ||
0bfeca3f | 518 | while ( (stream_get_endp(op->s) - stream_get_getp (op->s)) |
519 | > maxdatasize ) | |
520 | { | |
521 | /* data length of this frag is to next offset value */ | |
62d8e96a | 522 | iovp->iov_len = offset << OSPF_WRITE_FRAG_SHIFT; |
523 | iph->ip_len = iovp->iov_len + sizeof (struct ip); | |
6a99f831 | 524 | assert (iph->ip_len <= mtu); |
0bfeca3f | 525 | |
18b12c38 | 526 | sockopt_iphdrincl_swab_htosys (iph); |
0bfeca3f | 527 | |
6a99f831 | 528 | ret = sendmsg (fd, msg, flags); |
0bfeca3f | 529 | |
18b12c38 | 530 | sockopt_iphdrincl_swab_systoh (iph); |
0bfeca3f | 531 | |
532 | if (ret < 0) | |
37ccfa3d | 533 | zlog_warn ("*** ospf_write_frags: sendmsg failed to %s," |
5dcbdf82 | 534 | " id %d, off %d, len %d, mtu %u failed with %s", |
535 | inet_ntoa (iph->ip_dst), | |
536 | iph->ip_id, | |
537 | iph->ip_off, | |
538 | iph->ip_len, | |
539 | mtu, | |
540 | safe_strerror (errno)); | |
0bfeca3f | 541 | |
37ccfa3d | 542 | if (IS_DEBUG_OSPF_PACKET (type - 1, SEND)) |
543 | { | |
2a42e285 | 544 | zlog_debug ("ospf_write_frags: sent id %d, off %d, len %d to %s\n", |
37ccfa3d | 545 | iph->ip_id, iph->ip_off, iph->ip_len, |
546 | inet_ntoa (iph->ip_dst)); | |
547 | if (IS_DEBUG_OSPF_PACKET (type - 1, DETAIL)) | |
548 | { | |
2a42e285 | 549 | zlog_debug ("-----------------IP Header Dump----------------------"); |
37ccfa3d | 550 | ospf_ip_header_dump (iph); |
2a42e285 | 551 | zlog_debug ("-----------------------------------------------------"); |
37ccfa3d | 552 | } |
553 | } | |
554 | ||
0bfeca3f | 555 | iph->ip_off += offset; |
9985f83c | 556 | stream_forward_getp (op->s, iovp->iov_len); |
62d8e96a | 557 | iovp->iov_base = STREAM_PNT (op->s); |
0bfeca3f | 558 | } |
559 | ||
560 | /* setup for final fragment */ | |
62d8e96a | 561 | iovp->iov_len = stream_get_endp(op->s) - stream_get_getp (op->s); |
562 | iph->ip_len = iovp->iov_len + sizeof (struct ip); | |
0bfeca3f | 563 | iph->ip_off &= (~IP_MF); |
564 | } | |
565 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ | |
566 | ||
5dcbdf82 | 567 | static int |
718e3744 | 568 | ospf_write (struct thread *thread) |
569 | { | |
68980084 | 570 | struct ospf *ospf = THREAD_ARG (thread); |
718e3744 | 571 | struct ospf_interface *oi; |
572 | struct ospf_packet *op; | |
573 | struct sockaddr_in sa_dst; | |
718e3744 | 574 | struct ip iph; |
575 | struct msghdr msg; | |
62d8e96a | 576 | struct iovec iov[2]; |
68980084 | 577 | u_char type; |
578 | int ret; | |
579 | int flags = 0; | |
52dc7ee6 | 580 | struct listnode *node; |
0bfeca3f | 581 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
68b7339a | 582 | static u_int16_t ipid = 0; |
0bfeca3f | 583 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
6a99f831 | 584 | u_int16_t maxdatasize; |
68b7339a | 585 | #define OSPF_WRITE_IPHL_SHIFT 2 |
718e3744 | 586 | |
68980084 | 587 | ospf->t_write = NULL; |
718e3744 | 588 | |
68980084 | 589 | node = listhead (ospf->oi_write_q); |
718e3744 | 590 | assert (node); |
1eb8ef25 | 591 | oi = listgetdata (node); |
718e3744 | 592 | assert (oi); |
0bfeca3f | 593 | |
594 | #ifdef WANT_OSPF_WRITE_FRAGMENT | |
68b7339a | 595 | /* seed ipid static with low order bits of time */ |
596 | if (ipid == 0) | |
597 | ipid = (time(NULL) & 0xffff); | |
0bfeca3f | 598 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
599 | ||
68b7339a | 600 | /* convenience - max OSPF data per packet */ |
601 | maxdatasize = oi->ifp->mtu - sizeof (struct ip); | |
602 | ||
718e3744 | 603 | /* Get one packet from queue. */ |
604 | op = ospf_fifo_head (oi->obuf); | |
605 | assert (op); | |
606 | assert (op->length >= OSPF_HEADER_SIZE); | |
607 | ||
68980084 | 608 | if (op->dst.s_addr == htonl (OSPF_ALLSPFROUTERS) |
609 | || op->dst.s_addr == htonl (OSPF_ALLDROUTERS)) | |
68b7339a | 610 | ospf_if_ipmulticast (ospf, oi->address, oi->ifp->ifindex); |
611 | ||
718e3744 | 612 | /* Rewrite the md5 signature & update the seq */ |
613 | ospf_make_md5_digest (oi, op); | |
614 | ||
37ccfa3d | 615 | /* Retrieve OSPF packet type. */ |
616 | stream_set_getp (op->s, 1); | |
617 | type = stream_getc (op->s); | |
618 | ||
68b7339a | 619 | /* reset get pointer */ |
620 | stream_set_getp (op->s, 0); | |
621 | ||
622 | memset (&iph, 0, sizeof (struct ip)); | |
718e3744 | 623 | memset (&sa_dst, 0, sizeof (sa_dst)); |
68b7339a | 624 | |
718e3744 | 625 | sa_dst.sin_family = AF_INET; |
626 | #ifdef HAVE_SIN_LEN | |
627 | sa_dst.sin_len = sizeof(sa_dst); | |
628 | #endif /* HAVE_SIN_LEN */ | |
629 | sa_dst.sin_addr = op->dst; | |
630 | sa_dst.sin_port = htons (0); | |
631 | ||
632 | /* Set DONTROUTE flag if dst is unicast. */ | |
633 | if (oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
634 | if (!IN_MULTICAST (htonl (op->dst.s_addr))) | |
635 | flags = MSG_DONTROUTE; | |
636 | ||
68b7339a | 637 | iph.ip_hl = sizeof (struct ip) >> OSPF_WRITE_IPHL_SHIFT; |
638 | /* it'd be very strange for header to not be 4byte-word aligned but.. */ | |
6c835671 | 639 | if ( sizeof (struct ip) |
640 | > (unsigned int)(iph.ip_hl << OSPF_WRITE_IPHL_SHIFT) ) | |
68b7339a | 641 | iph.ip_hl++; /* we presume sizeof struct ip cant overflow ip_hl.. */ |
642 | ||
718e3744 | 643 | iph.ip_v = IPVERSION; |
68980084 | 644 | iph.ip_tos = IPTOS_PREC_INTERNETCONTROL; |
68b7339a | 645 | iph.ip_len = (iph.ip_hl << OSPF_WRITE_IPHL_SHIFT) + op->length; |
68b7339a | 646 | |
0bfeca3f | 647 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
68b7339a | 648 | /* XXX-MT: not thread-safe at all.. |
649 | * XXX: this presumes this is only programme sending OSPF packets | |
650 | * otherwise, no guarantee ipid will be unique | |
651 | */ | |
652 | iph.ip_id = ++ipid; | |
0bfeca3f | 653 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
654 | ||
718e3744 | 655 | iph.ip_off = 0; |
656 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
657 | iph.ip_ttl = OSPF_VL_IP_TTL; | |
658 | else | |
659 | iph.ip_ttl = OSPF_IP_TTL; | |
660 | iph.ip_p = IPPROTO_OSPFIGP; | |
661 | iph.ip_sum = 0; | |
662 | iph.ip_src.s_addr = oi->address->u.prefix4.s_addr; | |
663 | iph.ip_dst.s_addr = op->dst.s_addr; | |
664 | ||
665 | memset (&msg, 0, sizeof (msg)); | |
68defd6d | 666 | msg.msg_name = (caddr_t) &sa_dst; |
718e3744 | 667 | msg.msg_namelen = sizeof (sa_dst); |
668 | msg.msg_iov = iov; | |
669 | msg.msg_iovlen = 2; | |
670 | iov[0].iov_base = (char*)&iph; | |
68b7339a | 671 | iov[0].iov_len = iph.ip_hl << OSPF_WRITE_IPHL_SHIFT; |
672 | iov[1].iov_base = STREAM_PNT (op->s); | |
718e3744 | 673 | iov[1].iov_len = op->length; |
68b7339a | 674 | |
675 | /* Sadly we can not rely on kernels to fragment packets because of either | |
676 | * IP_HDRINCL and/or multicast destination being set. | |
677 | */ | |
0bfeca3f | 678 | #ifdef WANT_OSPF_WRITE_FRAGMENT |
68b7339a | 679 | if ( op->length > maxdatasize ) |
62d8e96a | 680 | ospf_write_frags (ospf->fd, op, &iph, &msg, maxdatasize, |
681 | oi->ifp->mtu, flags, type); | |
0bfeca3f | 682 | #endif /* WANT_OSPF_WRITE_FRAGMENT */ |
718e3744 | 683 | |
68b7339a | 684 | /* send final fragment (could be first) */ |
18b12c38 | 685 | sockopt_iphdrincl_swab_htosys (&iph); |
68980084 | 686 | ret = sendmsg (ospf->fd, &msg, flags); |
6b333611 | 687 | sockopt_iphdrincl_swab_systoh (&iph); |
718e3744 | 688 | |
689 | if (ret < 0) | |
083ee9d9 | 690 | zlog_warn ("*** sendmsg in ospf_write failed to %s, " |
5dcbdf82 | 691 | "id %d, off %d, len %d, interface %s, mtu %u: %s", |
083ee9d9 | 692 | inet_ntoa (iph.ip_dst), iph.ip_id, iph.ip_off, iph.ip_len, |
5dcbdf82 | 693 | oi->ifp->name, oi->ifp->mtu, safe_strerror (errno)); |
718e3744 | 694 | |
718e3744 | 695 | /* Show debug sending packet. */ |
696 | if (IS_DEBUG_OSPF_PACKET (type - 1, SEND)) | |
697 | { | |
698 | if (IS_DEBUG_OSPF_PACKET (type - 1, DETAIL)) | |
699 | { | |
2a42e285 | 700 | zlog_debug ("-----------------------------------------------------"); |
37ccfa3d | 701 | ospf_ip_header_dump (&iph); |
718e3744 | 702 | stream_set_getp (op->s, 0); |
703 | ospf_packet_dump (op->s); | |
704 | } | |
705 | ||
2a42e285 | 706 | zlog_debug ("%s sent to [%s] via [%s].", |
718e3744 | 707 | ospf_packet_type_str[type], inet_ntoa (op->dst), |
708 | IF_NAME (oi)); | |
709 | ||
710 | if (IS_DEBUG_OSPF_PACKET (type - 1, DETAIL)) | |
2a42e285 | 711 | zlog_debug ("-----------------------------------------------------"); |
718e3744 | 712 | } |
713 | ||
714 | /* Now delete packet from queue. */ | |
715 | ospf_packet_delete (oi); | |
716 | ||
717 | if (ospf_fifo_head (oi->obuf) == NULL) | |
718 | { | |
719 | oi->on_write_q = 0; | |
68980084 | 720 | list_delete_node (ospf->oi_write_q, node); |
718e3744 | 721 | } |
722 | ||
723 | /* If packets still remain in queue, call write thread. */ | |
68980084 | 724 | if (!list_isempty (ospf->oi_write_q)) |
725 | ospf->t_write = | |
726 | thread_add_write (master, ospf_write, ospf, ospf->fd); | |
718e3744 | 727 | |
728 | return 0; | |
729 | } | |
730 | ||
731 | /* OSPF Hello message read -- RFC2328 Section 10.5. */ | |
4dadc291 | 732 | static void |
718e3744 | 733 | ospf_hello (struct ip *iph, struct ospf_header *ospfh, |
734 | struct stream * s, struct ospf_interface *oi, int size) | |
735 | { | |
736 | struct ospf_hello *hello; | |
737 | struct ospf_neighbor *nbr; | |
718e3744 | 738 | int old_state; |
d3f0d621 | 739 | struct prefix p; |
718e3744 | 740 | |
741 | /* increment statistics. */ | |
742 | oi->hello_in++; | |
743 | ||
744 | hello = (struct ospf_hello *) STREAM_PNT (s); | |
745 | ||
746 | /* If Hello is myself, silently discard. */ | |
68980084 | 747 | if (IPV4_ADDR_SAME (&ospfh->router_id, &oi->ospf->router_id)) |
d324181c | 748 | { |
749 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) | |
750 | { | |
2a42e285 | 751 | zlog_debug ("ospf_header[%s/%s]: selforiginated, " |
d324181c | 752 | "dropping.", |
753 | ospf_packet_type_str[ospfh->type], | |
754 | inet_ntoa (iph->ip_src)); | |
755 | } | |
756 | return; | |
757 | } | |
718e3744 | 758 | |
759 | /* If incoming interface is passive one, ignore Hello. */ | |
f2c80652 | 760 | if (OSPF_IF_PARAM (oi, passive_interface) == OSPF_IF_PASSIVE) { |
ba6454ec | 761 | char buf[3][INET_ADDRSTRLEN]; |
6d45276f | 762 | zlog_debug ("ignoring HELLO from router %s sent to %s, " |
763 | "received on a passive interface, %s", | |
764 | inet_ntop(AF_INET, &ospfh->router_id, buf[0], sizeof(buf[0])), | |
765 | inet_ntop(AF_INET, &iph->ip_dst, buf[1], sizeof(buf[1])), | |
766 | inet_ntop(AF_INET, &oi->address->u.prefix4, | |
767 | buf[2], sizeof(buf[2]))); | |
ba6454ec | 768 | if (iph->ip_dst.s_addr == htonl(OSPF_ALLSPFROUTERS)) |
769 | { | |
770 | /* Try to fix multicast membership. */ | |
429ac78c | 771 | OI_MEMBER_JOINED(oi, MEMBER_ALLROUTERS); |
ba6454ec | 772 | ospf_if_set_multicast(oi); |
773 | } | |
718e3744 | 774 | return; |
f2c80652 | 775 | } |
718e3744 | 776 | |
777 | /* get neighbor prefix. */ | |
778 | p.family = AF_INET; | |
779 | p.prefixlen = ip_masklen (hello->network_mask); | |
780 | p.u.prefix4 = iph->ip_src; | |
781 | ||
782 | /* Compare network mask. */ | |
783 | /* Checking is ignored for Point-to-Point and Virtual link. */ | |
784 | if (oi->type != OSPF_IFTYPE_POINTOPOINT | |
785 | && oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
786 | if (oi->address->prefixlen != p.prefixlen) | |
787 | { | |
13cd3dc1 AS |
788 | zlog_warn ("Packet %s [Hello:RECV]: NetworkMask mismatch on %s (configured prefix length is %d, but hello packet indicates %d).", |
789 | inet_ntoa(ospfh->router_id), IF_NAME(oi), | |
790 | (int)oi->address->prefixlen, (int)p.prefixlen); | |
718e3744 | 791 | return; |
792 | } | |
793 | ||
718e3744 | 794 | /* Compare Router Dead Interval. */ |
795 | if (OSPF_IF_PARAM (oi, v_wait) != ntohl (hello->dead_interval)) | |
796 | { | |
797 | zlog_warn ("Packet %s [Hello:RECV]: RouterDeadInterval mismatch.", | |
798 | inet_ntoa (ospfh->router_id)); | |
799 | return; | |
800 | } | |
801 | ||
f9ad937f | 802 | /* Compare Hello Interval - ignored if fast-hellos are set. */ |
803 | if (OSPF_IF_PARAM (oi, fast_hello) == 0) | |
804 | { | |
805 | if (OSPF_IF_PARAM (oi, v_hello) != ntohs (hello->hello_interval)) | |
806 | { | |
807 | zlog_warn ("Packet %s [Hello:RECV]: HelloInterval mismatch.", | |
808 | inet_ntoa (ospfh->router_id)); | |
809 | return; | |
810 | } | |
811 | } | |
812 | ||
718e3744 | 813 | if (IS_DEBUG_OSPF_EVENT) |
2a42e285 | 814 | zlog_debug ("Packet %s [Hello:RECV]: Options %s", |
718e3744 | 815 | inet_ntoa (ospfh->router_id), |
816 | ospf_options_dump (hello->options)); | |
817 | ||
818 | /* Compare options. */ | |
819 | #define REJECT_IF_TBIT_ON 1 /* XXX */ | |
820 | #ifdef REJECT_IF_TBIT_ON | |
821 | if (CHECK_FLAG (hello->options, OSPF_OPTION_T)) | |
822 | { | |
823 | /* | |
824 | * This router does not support non-zero TOS. | |
825 | * Drop this Hello packet not to establish neighbor relationship. | |
826 | */ | |
827 | zlog_warn ("Packet %s [Hello:RECV]: T-bit on, drop it.", | |
828 | inet_ntoa (ospfh->router_id)); | |
829 | return; | |
830 | } | |
831 | #endif /* REJECT_IF_TBIT_ON */ | |
832 | ||
833 | #ifdef HAVE_OPAQUE_LSA | |
68980084 | 834 | if (CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE) |
718e3744 | 835 | && CHECK_FLAG (hello->options, OSPF_OPTION_O)) |
836 | { | |
837 | /* | |
838 | * This router does know the correct usage of O-bit | |
839 | * the bit should be set in DD packet only. | |
840 | */ | |
841 | zlog_warn ("Packet %s [Hello:RECV]: O-bit abuse?", | |
842 | inet_ntoa (ospfh->router_id)); | |
843 | #ifdef STRICT_OBIT_USAGE_CHECK | |
844 | return; /* Reject this packet. */ | |
845 | #else /* STRICT_OBIT_USAGE_CHECK */ | |
846 | UNSET_FLAG (hello->options, OSPF_OPTION_O); /* Ignore O-bit. */ | |
847 | #endif /* STRICT_OBIT_USAGE_CHECK */ | |
848 | } | |
849 | #endif /* HAVE_OPAQUE_LSA */ | |
850 | ||
851 | /* new for NSSA is to ensure that NP is on and E is off */ | |
852 | ||
718e3744 | 853 | if (oi->area->external_routing == OSPF_AREA_NSSA) |
854 | { | |
855 | if (! (CHECK_FLAG (OPTIONS (oi), OSPF_OPTION_NP) | |
856 | && CHECK_FLAG (hello->options, OSPF_OPTION_NP) | |
857 | && ! CHECK_FLAG (OPTIONS (oi), OSPF_OPTION_E) | |
858 | && ! CHECK_FLAG (hello->options, OSPF_OPTION_E))) | |
859 | { | |
860 | zlog_warn ("NSSA-Packet-%s[Hello:RECV]: my options: %x, his options %x", inet_ntoa (ospfh->router_id), OPTIONS (oi), hello->options); | |
861 | return; | |
862 | } | |
863 | if (IS_DEBUG_OSPF_NSSA) | |
2a42e285 | 864 | zlog_debug ("NSSA-Hello:RECV:Packet from %s:", inet_ntoa(ospfh->router_id)); |
718e3744 | 865 | } |
866 | else | |
718e3744 | 867 | /* The setting of the E-bit found in the Hello Packet's Options |
868 | field must match this area's ExternalRoutingCapability A | |
869 | mismatch causes processing to stop and the packet to be | |
870 | dropped. The setting of the rest of the bits in the Hello | |
871 | Packet's Options field should be ignored. */ | |
872 | if (CHECK_FLAG (OPTIONS (oi), OSPF_OPTION_E) != | |
873 | CHECK_FLAG (hello->options, OSPF_OPTION_E)) | |
874 | { | |
3aa8d5f9 | 875 | zlog_warn ("Packet %s [Hello:RECV]: my options: %x, his options %x", |
876 | inet_ntoa(ospfh->router_id), OPTIONS (oi), hello->options); | |
718e3744 | 877 | return; |
878 | } | |
718e3744 | 879 | |
d3f0d621 | 880 | /* get neighbour struct */ |
881 | nbr = ospf_nbr_get (oi, ospfh, iph, &p); | |
882 | ||
883 | /* neighbour must be valid, ospf_nbr_get creates if none existed */ | |
884 | assert (nbr); | |
718e3744 | 885 | |
886 | old_state = nbr->state; | |
887 | ||
888 | /* Add event to thread. */ | |
889 | OSPF_NSM_EVENT_EXECUTE (nbr, NSM_HelloReceived); | |
890 | ||
891 | /* RFC2328 Section 9.5.1 | |
892 | If the router is not eligible to become Designated Router, | |
893 | (snip) It must also send an Hello Packet in reply to an | |
894 | Hello Packet received from any eligible neighbor (other than | |
895 | the current Designated Router and Backup Designated Router). */ | |
896 | if (oi->type == OSPF_IFTYPE_NBMA) | |
897 | if (PRIORITY(oi) == 0 && hello->priority > 0 | |
898 | && IPV4_ADDR_CMP(&DR(oi), &iph->ip_src) | |
899 | && IPV4_ADDR_CMP(&BDR(oi), &iph->ip_src)) | |
900 | OSPF_NSM_TIMER_ON (nbr->t_hello_reply, ospf_hello_reply_timer, | |
901 | OSPF_HELLO_REPLY_DELAY); | |
902 | ||
903 | /* on NBMA network type, it happens to receive bidirectional Hello packet | |
904 | without advance 1-Way Received event. | |
905 | To avoid incorrect DR-seletion, raise 1-Way Received event.*/ | |
906 | if (oi->type == OSPF_IFTYPE_NBMA && | |
907 | (old_state == NSM_Down || old_state == NSM_Attempt)) | |
908 | { | |
909 | OSPF_NSM_EVENT_EXECUTE (nbr, NSM_OneWayReceived); | |
910 | nbr->priority = hello->priority; | |
911 | nbr->d_router = hello->d_router; | |
912 | nbr->bd_router = hello->bd_router; | |
913 | return; | |
914 | } | |
915 | ||
68980084 | 916 | if (ospf_nbr_bidirectional (&oi->ospf->router_id, hello->neighbors, |
718e3744 | 917 | size - OSPF_HELLO_MIN_SIZE)) |
918 | { | |
919 | OSPF_NSM_EVENT_EXECUTE (nbr, NSM_TwoWayReceived); | |
920 | nbr->options |= hello->options; | |
921 | } | |
922 | else | |
923 | { | |
924 | OSPF_NSM_EVENT_EXECUTE (nbr, NSM_OneWayReceived); | |
925 | /* Set neighbor information. */ | |
926 | nbr->priority = hello->priority; | |
927 | nbr->d_router = hello->d_router; | |
928 | nbr->bd_router = hello->bd_router; | |
929 | return; | |
930 | } | |
931 | ||
932 | /* If neighbor itself declares DR and no BDR exists, | |
933 | cause event BackupSeen */ | |
934 | if (IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->d_router)) | |
935 | if (hello->bd_router.s_addr == 0 && oi->state == ISM_Waiting) | |
936 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_BackupSeen); | |
937 | ||
938 | /* neighbor itself declares BDR. */ | |
939 | if (oi->state == ISM_Waiting && | |
940 | IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->bd_router)) | |
941 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_BackupSeen); | |
942 | ||
943 | /* had not previously. */ | |
944 | if ((IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->d_router) && | |
945 | IPV4_ADDR_CMP (&nbr->address.u.prefix4, &nbr->d_router)) || | |
946 | (IPV4_ADDR_CMP (&nbr->address.u.prefix4, &hello->d_router) && | |
947 | IPV4_ADDR_SAME (&nbr->address.u.prefix4, &nbr->d_router))) | |
948 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_NeighborChange); | |
949 | ||
950 | /* had not previously. */ | |
951 | if ((IPV4_ADDR_SAME (&nbr->address.u.prefix4, &hello->bd_router) && | |
952 | IPV4_ADDR_CMP (&nbr->address.u.prefix4, &nbr->bd_router)) || | |
953 | (IPV4_ADDR_CMP (&nbr->address.u.prefix4, &hello->bd_router) && | |
954 | IPV4_ADDR_SAME (&nbr->address.u.prefix4, &nbr->bd_router))) | |
955 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_NeighborChange); | |
956 | ||
957 | /* Neighbor priority check. */ | |
958 | if (nbr->priority >= 0 && nbr->priority != hello->priority) | |
959 | OSPF_ISM_EVENT_SCHEDULE (oi, ISM_NeighborChange); | |
960 | ||
961 | /* Set neighbor information. */ | |
962 | nbr->priority = hello->priority; | |
963 | nbr->d_router = hello->d_router; | |
964 | nbr->bd_router = hello->bd_router; | |
965 | } | |
966 | ||
967 | /* Save DD flags/options/Seqnum received. */ | |
4dadc291 | 968 | static void |
718e3744 | 969 | ospf_db_desc_save_current (struct ospf_neighbor *nbr, |
970 | struct ospf_db_desc *dd) | |
971 | { | |
972 | nbr->last_recv.flags = dd->flags; | |
973 | nbr->last_recv.options = dd->options; | |
974 | nbr->last_recv.dd_seqnum = ntohl (dd->dd_seqnum); | |
975 | } | |
976 | ||
977 | /* Process rest of DD packet. */ | |
978 | static void | |
979 | ospf_db_desc_proc (struct stream *s, struct ospf_interface *oi, | |
980 | struct ospf_neighbor *nbr, struct ospf_db_desc *dd, | |
981 | u_int16_t size) | |
982 | { | |
983 | struct ospf_lsa *new, *find; | |
984 | struct lsa_header *lsah; | |
985 | ||
9985f83c | 986 | stream_forward_getp (s, OSPF_DB_DESC_MIN_SIZE); |
718e3744 | 987 | for (size -= OSPF_DB_DESC_MIN_SIZE; |
988 | size >= OSPF_LSA_HEADER_SIZE; size -= OSPF_LSA_HEADER_SIZE) | |
989 | { | |
990 | lsah = (struct lsa_header *) STREAM_PNT (s); | |
9985f83c | 991 | stream_forward_getp (s, OSPF_LSA_HEADER_SIZE); |
718e3744 | 992 | |
993 | /* Unknown LS type. */ | |
994 | if (lsah->type < OSPF_MIN_LSA || lsah->type >= OSPF_MAX_LSA) | |
995 | { | |
bec595ad | 996 | zlog_warn ("Packet [DD:RECV]: Unknown LS type %d.", lsah->type); |
718e3744 | 997 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
998 | return; | |
999 | } | |
1000 | ||
1001 | #ifdef HAVE_OPAQUE_LSA | |
1002 | if (IS_OPAQUE_LSA (lsah->type) | |
1003 | && ! CHECK_FLAG (nbr->options, OSPF_OPTION_O)) | |
1004 | { | |
1005 | zlog_warn ("LSA[Type%d:%s]: Opaque capability mismatch?", lsah->type, inet_ntoa (lsah->id)); | |
1006 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); | |
1007 | return; | |
1008 | } | |
1009 | #endif /* HAVE_OPAQUE_LSA */ | |
1010 | ||
1011 | switch (lsah->type) | |
1012 | { | |
1013 | case OSPF_AS_EXTERNAL_LSA: | |
1014 | #ifdef HAVE_OPAQUE_LSA | |
1015 | case OSPF_OPAQUE_AS_LSA: | |
1016 | #endif /* HAVE_OPAQUE_LSA */ | |
718e3744 | 1017 | /* Check for stub area. Reject if AS-External from stub but |
1018 | allow if from NSSA. */ | |
1019 | if (oi->area->external_routing == OSPF_AREA_STUB) | |
718e3744 | 1020 | { |
1021 | zlog_warn ("Packet [DD:RECV]: LSA[Type%d:%s] from %s area.", | |
1022 | lsah->type, inet_ntoa (lsah->id), | |
1023 | (oi->area->external_routing == OSPF_AREA_STUB) ?\ | |
1024 | "STUB" : "NSSA"); | |
1025 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); | |
1026 | return; | |
1027 | } | |
1028 | break; | |
1029 | default: | |
1030 | break; | |
1031 | } | |
1032 | ||
1033 | /* Create LS-request object. */ | |
1034 | new = ospf_ls_request_new (lsah); | |
1035 | ||
1036 | /* Lookup received LSA, then add LS request list. */ | |
1037 | find = ospf_lsa_lookup_by_header (oi->area, lsah); | |
1038 | if (!find || ospf_lsa_more_recent (find, new) < 0) | |
1039 | { | |
1040 | ospf_ls_request_add (nbr, new); | |
1041 | ospf_lsa_discard (new); | |
1042 | } | |
1043 | else | |
1044 | { | |
1045 | /* Received LSA is not recent. */ | |
1046 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1047 | zlog_debug ("Packet [DD:RECV]: LSA received Type %d, " |
718e3744 | 1048 | "ID %s is not recent.", lsah->type, inet_ntoa (lsah->id)); |
1049 | ospf_lsa_discard (new); | |
1050 | continue; | |
1051 | } | |
1052 | } | |
1053 | ||
1054 | /* Master */ | |
1055 | if (IS_SET_DD_MS (nbr->dd_flags)) | |
1056 | { | |
1057 | nbr->dd_seqnum++; | |
8dd24ee6 PJ |
1058 | |
1059 | /* Both sides have no More, then we're done with Exchange */ | |
718e3744 | 1060 | if (!IS_SET_DD_M (dd->flags) && !IS_SET_DD_M (nbr->dd_flags)) |
1061 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_ExchangeDone); | |
1062 | else | |
718e3744 | 1063 | ospf_db_desc_send (nbr); |
1064 | } | |
1065 | /* Slave */ | |
1066 | else | |
1067 | { | |
1068 | nbr->dd_seqnum = ntohl (dd->dd_seqnum); | |
1069 | ||
8dd24ee6 PJ |
1070 | /* Send DD packet in reply. |
1071 | * | |
1072 | * Must be done to acknowledge the Master's DD, regardless of | |
1073 | * whether we have more LSAs ourselves to describe. | |
1074 | * | |
1075 | * This function will clear the 'More' bit, if after this DD | |
1076 | * we have no more LSAs to describe to the master.. | |
1077 | */ | |
718e3744 | 1078 | ospf_db_desc_send (nbr); |
8dd24ee6 PJ |
1079 | |
1080 | /* Slave can raise ExchangeDone now, if master is also done */ | |
1081 | if (!IS_SET_DD_M (dd->flags) && !IS_SET_DD_M (nbr->dd_flags)) | |
1082 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_ExchangeDone); | |
718e3744 | 1083 | } |
8dd24ee6 | 1084 | |
718e3744 | 1085 | /* Save received neighbor values from DD. */ |
1086 | ospf_db_desc_save_current (nbr, dd); | |
1087 | } | |
1088 | ||
4dadc291 | 1089 | static int |
718e3744 | 1090 | ospf_db_desc_is_dup (struct ospf_db_desc *dd, struct ospf_neighbor *nbr) |
1091 | { | |
1092 | /* Is DD duplicated? */ | |
1093 | if (dd->options == nbr->last_recv.options && | |
1094 | dd->flags == nbr->last_recv.flags && | |
1095 | dd->dd_seqnum == htonl (nbr->last_recv.dd_seqnum)) | |
1096 | return 1; | |
1097 | ||
1098 | return 0; | |
1099 | } | |
1100 | ||
1101 | /* OSPF Database Description message read -- RFC2328 Section 10.6. */ | |
3aa8d5f9 | 1102 | static void |
718e3744 | 1103 | ospf_db_desc (struct ip *iph, struct ospf_header *ospfh, |
1104 | struct stream *s, struct ospf_interface *oi, u_int16_t size) | |
1105 | { | |
1106 | struct ospf_db_desc *dd; | |
1107 | struct ospf_neighbor *nbr; | |
1108 | ||
1109 | /* Increment statistics. */ | |
1110 | oi->db_desc_in++; | |
1111 | ||
1112 | dd = (struct ospf_db_desc *) STREAM_PNT (s); | |
d363df2c | 1113 | |
d3f0d621 | 1114 | nbr = ospf_nbr_lookup (oi, iph, ospfh); |
718e3744 | 1115 | if (nbr == NULL) |
1116 | { | |
1117 | zlog_warn ("Packet[DD]: Unknown Neighbor %s", | |
1118 | inet_ntoa (ospfh->router_id)); | |
1119 | return; | |
1120 | } | |
1121 | ||
1122 | /* Check MTU. */ | |
ba682537 | 1123 | if ((OSPF_IF_PARAM (oi, mtu_ignore) == 0) && |
1124 | (ntohs (dd->mtu) > oi->ifp->mtu)) | |
718e3744 | 1125 | { |
3aa8d5f9 | 1126 | zlog_warn ("Packet[DD]: Neighbor %s MTU %u is larger than [%s]'s MTU %u", |
1127 | inet_ntoa (nbr->router_id), ntohs (dd->mtu), | |
1128 | IF_NAME (oi), oi->ifp->mtu); | |
718e3744 | 1129 | return; |
1130 | } | |
1131 | ||
d363df2c | 1132 | /* |
1133 | * XXX HACK by Hasso Tepper. Setting N/P bit in NSSA area DD packets is not | |
1134 | * required. In fact at least JunOS sends DD packets with P bit clear. | |
1135 | * Until proper solution is developped, this hack should help. | |
1136 | * | |
1137 | * Update: According to the RFCs, N bit is specified /only/ for Hello | |
1138 | * options, unfortunately its use in DD options is not specified. Hence some | |
1139 | * implementations follow E-bit semantics and set it in DD options, and some | |
1140 | * treat it as unspecified and hence follow the directive "default for | |
1141 | * options is clear", ie unset. | |
1142 | * | |
1143 | * Reset the flag, as ospfd follows E-bit semantics. | |
1144 | */ | |
1145 | if ( (oi->area->external_routing == OSPF_AREA_NSSA) | |
1146 | && (CHECK_FLAG (nbr->options, OSPF_OPTION_NP)) | |
1147 | && (!CHECK_FLAG (dd->options, OSPF_OPTION_NP)) ) | |
1148 | { | |
1149 | if (IS_DEBUG_OSPF_EVENT) | |
1210fa66 | 1150 | zlog_debug ("Packet[DD]: Neighbour %s: Has NSSA capability, sends with N bit clear in DD options", |
d363df2c | 1151 | inet_ntoa (nbr->router_id) ); |
1152 | SET_FLAG (dd->options, OSPF_OPTION_NP); | |
1153 | } | |
d363df2c | 1154 | |
718e3744 | 1155 | #ifdef REJECT_IF_TBIT_ON |
1156 | if (CHECK_FLAG (dd->options, OSPF_OPTION_T)) | |
1157 | { | |
1158 | /* | |
1159 | * In Hello protocol, optional capability must have checked | |
1160 | * to prevent this T-bit enabled router be my neighbor. | |
1161 | */ | |
1162 | zlog_warn ("Packet[DD]: Neighbor %s: T-bit on?", inet_ntoa (nbr->router_id)); | |
1163 | return; | |
1164 | } | |
1165 | #endif /* REJECT_IF_TBIT_ON */ | |
1166 | ||
1167 | #ifdef HAVE_OPAQUE_LSA | |
1168 | if (CHECK_FLAG (dd->options, OSPF_OPTION_O) | |
68980084 | 1169 | && !CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE)) |
718e3744 | 1170 | { |
1171 | /* | |
1172 | * This node is not configured to handle O-bit, for now. | |
1173 | * Clear it to ignore unsupported capability proposed by neighbor. | |
1174 | */ | |
1175 | UNSET_FLAG (dd->options, OSPF_OPTION_O); | |
1176 | } | |
1177 | #endif /* HAVE_OPAQUE_LSA */ | |
1178 | ||
1179 | /* Process DD packet by neighbor status. */ | |
1180 | switch (nbr->state) | |
1181 | { | |
1182 | case NSM_Down: | |
1183 | case NSM_Attempt: | |
1184 | case NSM_TwoWay: | |
bec595ad | 1185 | zlog_warn ("Packet[DD]: Neighbor %s state is %s, packet discarded.", |
3aa8d5f9 | 1186 | inet_ntoa(nbr->router_id), |
718e3744 | 1187 | LOOKUP (ospf_nsm_state_msg, nbr->state)); |
1188 | break; | |
1189 | case NSM_Init: | |
1190 | OSPF_NSM_EVENT_EXECUTE (nbr, NSM_TwoWayReceived); | |
1191 | /* If the new state is ExStart, the processing of the current | |
1192 | packet should then continue in this new state by falling | |
1193 | through to case ExStart below. */ | |
1194 | if (nbr->state != NSM_ExStart) | |
1195 | break; | |
1196 | case NSM_ExStart: | |
1197 | /* Initial DBD */ | |
1198 | if ((IS_SET_DD_ALL (dd->flags) == OSPF_DD_FLAG_ALL) && | |
1199 | (size == OSPF_DB_DESC_MIN_SIZE)) | |
1200 | { | |
68980084 | 1201 | if (IPV4_ADDR_CMP (&nbr->router_id, &oi->ospf->router_id) > 0) |
718e3744 | 1202 | { |
1203 | /* We're Slave---obey */ | |
17eaa728 | 1204 | zlog_info ("Packet[DD]: Neighbor %s Negotiation done (Slave).", |
3aa8d5f9 | 1205 | inet_ntoa(nbr->router_id)); |
718e3744 | 1206 | nbr->dd_seqnum = ntohl (dd->dd_seqnum); |
8dd24ee6 PJ |
1207 | |
1208 | /* Reset I/MS */ | |
1209 | UNSET_FLAG (nbr->dd_flags, (OSPF_DD_FLAG_MS|OSPF_DD_FLAG_I)); | |
718e3744 | 1210 | } |
1211 | else | |
1212 | { | |
1213 | /* We're Master, ignore the initial DBD from Slave */ | |
6d45276f | 1214 | zlog_info ("Packet[DD]: Neighbor %s: Initial DBD from Slave, " |
3aa8d5f9 | 1215 | "ignoring.", inet_ntoa(nbr->router_id)); |
718e3744 | 1216 | break; |
1217 | } | |
1218 | } | |
1219 | /* Ack from the Slave */ | |
1220 | else if (!IS_SET_DD_MS (dd->flags) && !IS_SET_DD_I (dd->flags) && | |
1221 | ntohl (dd->dd_seqnum) == nbr->dd_seqnum && | |
68980084 | 1222 | IPV4_ADDR_CMP (&nbr->router_id, &oi->ospf->router_id) < 0) |
718e3744 | 1223 | { |
17eaa728 | 1224 | zlog_info ("Packet[DD]: Neighbor %s Negotiation done (Master).", |
3aa8d5f9 | 1225 | inet_ntoa(nbr->router_id)); |
8dd24ee6 PJ |
1226 | /* Reset I, leaving MS */ |
1227 | UNSET_FLAG (nbr->dd_flags, OSPF_DD_FLAG_I); | |
718e3744 | 1228 | } |
1229 | else | |
1230 | { | |
3aa8d5f9 | 1231 | zlog_warn ("Packet[DD]: Neighbor %s Negotiation fails.", |
1232 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1233 | break; |
1234 | } | |
1235 | ||
1236 | /* This is where the real Options are saved */ | |
1237 | nbr->options = dd->options; | |
1238 | ||
1239 | #ifdef HAVE_OPAQUE_LSA | |
68980084 | 1240 | if (CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE)) |
718e3744 | 1241 | { |
1242 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1243 | zlog_debug ("Neighbor[%s] is %sOpaque-capable.", |
718e3744 | 1244 | inet_ntoa (nbr->router_id), |
1245 | CHECK_FLAG (nbr->options, OSPF_OPTION_O) ? "" : "NOT "); | |
1246 | ||
1247 | if (! CHECK_FLAG (nbr->options, OSPF_OPTION_O) | |
1248 | && IPV4_ADDR_SAME (&DR (oi), &nbr->address.u.prefix4)) | |
1249 | { | |
6d45276f | 1250 | zlog_warn ("DR-neighbor[%s] is NOT opaque-capable; " |
1251 | "Opaque-LSAs cannot be reliably advertised " | |
1252 | "in this network.", | |
1253 | inet_ntoa (nbr->router_id)); | |
718e3744 | 1254 | /* This situation is undesirable, but not a real error. */ |
1255 | } | |
1256 | } | |
1257 | #endif /* HAVE_OPAQUE_LSA */ | |
1258 | ||
1259 | OSPF_NSM_EVENT_EXECUTE (nbr, NSM_NegotiationDone); | |
1260 | ||
1261 | /* continue processing rest of packet. */ | |
1262 | ospf_db_desc_proc (s, oi, nbr, dd, size); | |
1263 | break; | |
1264 | case NSM_Exchange: | |
1265 | if (ospf_db_desc_is_dup (dd, nbr)) | |
1266 | { | |
1267 | if (IS_SET_DD_MS (nbr->dd_flags)) | |
1268 | /* Master: discard duplicated DD packet. */ | |
6d45276f | 1269 | zlog_info ("Packet[DD] (Master): Neighbor %s packet duplicated.", |
3aa8d5f9 | 1270 | inet_ntoa (nbr->router_id)); |
718e3744 | 1271 | else |
1272 | /* Slave: cause to retransmit the last Database Description. */ | |
1273 | { | |
6d45276f | 1274 | zlog_info ("Packet[DD] [Slave]: Neighbor %s packet duplicated.", |
3aa8d5f9 | 1275 | inet_ntoa (nbr->router_id)); |
718e3744 | 1276 | ospf_db_desc_resend (nbr); |
1277 | } | |
1278 | break; | |
1279 | } | |
1280 | ||
1281 | /* Otherwise DD packet should be checked. */ | |
1282 | /* Check Master/Slave bit mismatch */ | |
1283 | if (IS_SET_DD_MS (dd->flags) != IS_SET_DD_MS (nbr->last_recv.flags)) | |
1284 | { | |
3aa8d5f9 | 1285 | zlog_warn ("Packet[DD]: Neighbor %s MS-bit mismatch.", |
1286 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1287 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1288 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1289 | zlog_debug ("Packet[DD]: dd->flags=%d, nbr->dd_flags=%d", |
3aa8d5f9 | 1290 | dd->flags, nbr->dd_flags); |
718e3744 | 1291 | break; |
1292 | } | |
1293 | ||
1294 | /* Check initialize bit is set. */ | |
1295 | if (IS_SET_DD_I (dd->flags)) | |
1296 | { | |
6d45276f | 1297 | zlog_info ("Packet[DD]: Neighbor %s I-bit set.", |
3aa8d5f9 | 1298 | inet_ntoa(nbr->router_id)); |
718e3744 | 1299 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1300 | break; | |
1301 | } | |
1302 | ||
1303 | /* Check DD Options. */ | |
1304 | if (dd->options != nbr->options) | |
1305 | { | |
1306 | #ifdef ORIGINAL_CODING | |
1307 | /* Save the new options for debugging */ | |
1308 | nbr->options = dd->options; | |
1309 | #endif /* ORIGINAL_CODING */ | |
3aa8d5f9 | 1310 | zlog_warn ("Packet[DD]: Neighbor %s options mismatch.", |
1311 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1312 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1313 | break; | |
1314 | } | |
1315 | ||
1316 | /* Check DD sequence number. */ | |
1317 | if ((IS_SET_DD_MS (nbr->dd_flags) && | |
1318 | ntohl (dd->dd_seqnum) != nbr->dd_seqnum) || | |
1319 | (!IS_SET_DD_MS (nbr->dd_flags) && | |
1320 | ntohl (dd->dd_seqnum) != nbr->dd_seqnum + 1)) | |
1321 | { | |
3aa8d5f9 | 1322 | zlog_warn ("Packet[DD]: Neighbor %s sequence number mismatch.", |
1323 | inet_ntoa(nbr->router_id)); | |
718e3744 | 1324 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); |
1325 | break; | |
1326 | } | |
1327 | ||
1328 | /* Continue processing rest of packet. */ | |
1329 | ospf_db_desc_proc (s, oi, nbr, dd, size); | |
1330 | break; | |
1331 | case NSM_Loading: | |
1332 | case NSM_Full: | |
1333 | if (ospf_db_desc_is_dup (dd, nbr)) | |
1334 | { | |
1335 | if (IS_SET_DD_MS (nbr->dd_flags)) | |
1336 | { | |
1337 | /* Master should discard duplicate DD packet. */ | |
6d45276f | 1338 | zlog_info ("Packet[DD]: Neighbor %s duplicated, " |
1339 | "packet discarded.", | |
3aa8d5f9 | 1340 | inet_ntoa(nbr->router_id)); |
718e3744 | 1341 | break; |
1342 | } | |
1343 | else | |
1344 | { | |
1345 | struct timeval t, now; | |
1346 | gettimeofday (&now, NULL); | |
1347 | t = tv_sub (now, nbr->last_send_ts); | |
1348 | if (tv_cmp (t, int2tv (nbr->v_inactivity)) < 0) | |
1349 | { | |
1350 | /* In states Loading and Full the slave must resend | |
1351 | its last Database Description packet in response to | |
1352 | duplicate Database Description packets received | |
1353 | from the master. For this reason the slave must | |
1354 | wait RouterDeadInterval seconds before freeing the | |
1355 | last Database Description packet. Reception of a | |
1356 | Database Description packet from the master after | |
1357 | this interval will generate a SeqNumberMismatch | |
1358 | neighbor event. RFC2328 Section 10.8 */ | |
1359 | ospf_db_desc_resend (nbr); | |
1360 | break; | |
1361 | } | |
1362 | } | |
1363 | } | |
1364 | ||
1365 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_SeqNumberMismatch); | |
1366 | break; | |
1367 | default: | |
3aa8d5f9 | 1368 | zlog_warn ("Packet[DD]: Neighbor %s NSM illegal status %u.", |
1369 | inet_ntoa(nbr->router_id), nbr->state); | |
718e3744 | 1370 | break; |
1371 | } | |
1372 | } | |
1373 | ||
1374 | #define OSPF_LSA_KEY_SIZE 12 /* type(4) + id(4) + ar(4) */ | |
1375 | ||
1376 | /* OSPF Link State Request Read -- RFC2328 Section 10.7. */ | |
4dadc291 | 1377 | static void |
718e3744 | 1378 | ospf_ls_req (struct ip *iph, struct ospf_header *ospfh, |
1379 | struct stream *s, struct ospf_interface *oi, u_int16_t size) | |
1380 | { | |
1381 | struct ospf_neighbor *nbr; | |
1382 | u_int32_t ls_type; | |
1383 | struct in_addr ls_id; | |
1384 | struct in_addr adv_router; | |
1385 | struct ospf_lsa *find; | |
52dc7ee6 | 1386 | struct list *ls_upd; |
6c835671 | 1387 | unsigned int length; |
718e3744 | 1388 | |
1389 | /* Increment statistics. */ | |
1390 | oi->ls_req_in++; | |
1391 | ||
d3f0d621 | 1392 | nbr = ospf_nbr_lookup (oi, iph, ospfh); |
718e3744 | 1393 | if (nbr == NULL) |
1394 | { | |
1395 | zlog_warn ("Link State Request: Unknown Neighbor %s.", | |
1396 | inet_ntoa (ospfh->router_id)); | |
1397 | return; | |
1398 | } | |
1399 | ||
1400 | /* Neighbor State should be Exchange or later. */ | |
1401 | if (nbr->state != NSM_Exchange && | |
1402 | nbr->state != NSM_Loading && | |
1403 | nbr->state != NSM_Full) | |
1404 | { | |
bec595ad | 1405 | zlog_warn ("Link State Request received from %s: " |
1406 | "Neighbor state is %s, packet discarded.", | |
1407 | inet_ntoa (ospfh->router_id), | |
718e3744 | 1408 | LOOKUP (ospf_nsm_state_msg, nbr->state)); |
1409 | return; | |
1410 | } | |
1411 | ||
1412 | /* Send Link State Update for ALL requested LSAs. */ | |
1413 | ls_upd = list_new (); | |
1414 | length = OSPF_HEADER_SIZE + OSPF_LS_UPD_MIN_SIZE; | |
1415 | ||
1416 | while (size >= OSPF_LSA_KEY_SIZE) | |
1417 | { | |
1418 | /* Get one slice of Link State Request. */ | |
1419 | ls_type = stream_getl (s); | |
1420 | ls_id.s_addr = stream_get_ipv4 (s); | |
1421 | adv_router.s_addr = stream_get_ipv4 (s); | |
1422 | ||
1423 | /* Verify LSA type. */ | |
1424 | if (ls_type < OSPF_MIN_LSA || ls_type >= OSPF_MAX_LSA) | |
1425 | { | |
1426 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_BadLSReq); | |
1427 | list_delete (ls_upd); | |
1428 | return; | |
1429 | } | |
1430 | ||
1431 | /* Search proper LSA in LSDB. */ | |
1432 | find = ospf_lsa_lookup (oi->area, ls_type, ls_id, adv_router); | |
1433 | if (find == NULL) | |
1434 | { | |
1435 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_BadLSReq); | |
1436 | list_delete (ls_upd); | |
1437 | return; | |
1438 | } | |
1439 | ||
86f1fd96 | 1440 | /* Packet overflows MTU size, send immediately. */ |
1441 | if (length + ntohs (find->data->length) > ospf_packet_max (oi)) | |
718e3744 | 1442 | { |
1443 | if (oi->type == OSPF_IFTYPE_NBMA) | |
1444 | ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_DIRECT); | |
1445 | else | |
1446 | ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_INDIRECT); | |
1447 | ||
1448 | /* Only remove list contents. Keep ls_upd. */ | |
1449 | list_delete_all_node (ls_upd); | |
1450 | ||
1451 | length = OSPF_HEADER_SIZE + OSPF_LS_UPD_MIN_SIZE; | |
1452 | } | |
1453 | ||
1454 | /* Append LSA to update list. */ | |
1455 | listnode_add (ls_upd, find); | |
1456 | length += ntohs (find->data->length); | |
1457 | ||
1458 | size -= OSPF_LSA_KEY_SIZE; | |
1459 | } | |
1460 | ||
1461 | /* Send rest of Link State Update. */ | |
1462 | if (listcount (ls_upd) > 0) | |
1463 | { | |
1464 | if (oi->type == OSPF_IFTYPE_NBMA) | |
1465 | ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_DIRECT); | |
1466 | else | |
1467 | ospf_ls_upd_send (nbr, ls_upd, OSPF_SEND_PACKET_INDIRECT); | |
1468 | ||
1469 | list_delete (ls_upd); | |
1470 | } | |
1471 | else | |
1472 | list_free (ls_upd); | |
1473 | } | |
1474 | ||
1475 | /* Get the list of LSAs from Link State Update packet. | |
1476 | And process some validation -- RFC2328 Section 13. (1)-(2). */ | |
52dc7ee6 | 1477 | static struct list * |
718e3744 | 1478 | ospf_ls_upd_list_lsa (struct ospf_neighbor *nbr, struct stream *s, |
1479 | struct ospf_interface *oi, size_t size) | |
1480 | { | |
1481 | u_int16_t count, sum; | |
1482 | u_int32_t length; | |
1483 | struct lsa_header *lsah; | |
1484 | struct ospf_lsa *lsa; | |
52dc7ee6 | 1485 | struct list *lsas; |
718e3744 | 1486 | |
1487 | lsas = list_new (); | |
1488 | ||
1489 | count = stream_getl (s); | |
1490 | size -= OSPF_LS_UPD_MIN_SIZE; /* # LSAs */ | |
1491 | ||
1492 | for (; size >= OSPF_LSA_HEADER_SIZE && count > 0; | |
9985f83c | 1493 | size -= length, stream_forward_getp (s, length), count--) |
718e3744 | 1494 | { |
1495 | lsah = (struct lsa_header *) STREAM_PNT (s); | |
1496 | length = ntohs (lsah->length); | |
1497 | ||
1498 | if (length > size) | |
1499 | { | |
1500 | zlog_warn ("Link State Update: LSA length exceeds packet size."); | |
1501 | break; | |
1502 | } | |
1503 | ||
1504 | /* Validate the LSA's LS checksum. */ | |
1505 | sum = lsah->checksum; | |
1506 | if (sum != ospf_lsa_checksum (lsah)) | |
1507 | { | |
1508 | zlog_warn ("Link State Update: LSA checksum error %x, %x.", | |
1509 | sum, lsah->checksum); | |
1510 | continue; | |
1511 | } | |
1512 | ||
1513 | /* Examine the LSA's LS type. */ | |
1514 | if (lsah->type < OSPF_MIN_LSA || lsah->type >= OSPF_MAX_LSA) | |
1515 | { | |
1516 | zlog_warn ("Link State Update: Unknown LS type %d", lsah->type); | |
1517 | continue; | |
1518 | } | |
1519 | ||
1520 | /* | |
1521 | * What if the received LSA's age is greater than MaxAge? | |
1522 | * Treat it as a MaxAge case -- endo. | |
1523 | */ | |
1524 | if (ntohs (lsah->ls_age) > OSPF_LSA_MAXAGE) | |
1525 | lsah->ls_age = htons (OSPF_LSA_MAXAGE); | |
1526 | ||
1527 | #ifdef HAVE_OPAQUE_LSA | |
1528 | if (CHECK_FLAG (nbr->options, OSPF_OPTION_O)) | |
1529 | { | |
1530 | #ifdef STRICT_OBIT_USAGE_CHECK | |
1531 | if ((IS_OPAQUE_LSA(lsah->type) && | |
1532 | ! CHECK_FLAG (lsah->options, OSPF_OPTION_O)) | |
1533 | || (! IS_OPAQUE_LSA(lsah->type) && | |
1534 | CHECK_FLAG (lsah->options, OSPF_OPTION_O))) | |
1535 | { | |
1536 | /* | |
1537 | * This neighbor must know the exact usage of O-bit; | |
1538 | * the bit will be set in Type-9,10,11 LSAs only. | |
1539 | */ | |
1540 | zlog_warn ("LSA[Type%d:%s]: O-bit abuse?", lsah->type, inet_ntoa (lsah->id)); | |
1541 | continue; | |
1542 | } | |
1543 | #endif /* STRICT_OBIT_USAGE_CHECK */ | |
1544 | ||
1545 | /* Do not take in AS External Opaque-LSAs if we are a stub. */ | |
1546 | if (lsah->type == OSPF_OPAQUE_AS_LSA | |
1547 | && nbr->oi->area->external_routing != OSPF_AREA_DEFAULT) | |
1548 | { | |
1549 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1550 | zlog_debug ("LSA[Type%d:%s]: We are a stub, don't take this LSA.", lsah->type, inet_ntoa (lsah->id)); |
718e3744 | 1551 | continue; |
1552 | } | |
1553 | } | |
1554 | else if (IS_OPAQUE_LSA(lsah->type)) | |
1555 | { | |
1556 | zlog_warn ("LSA[Type%d:%s]: Opaque capability mismatch?", lsah->type, inet_ntoa (lsah->id)); | |
1557 | continue; | |
1558 | } | |
1559 | #endif /* HAVE_OPAQUE_LSA */ | |
1560 | ||
1561 | /* Create OSPF LSA instance. */ | |
1562 | lsa = ospf_lsa_new (); | |
1563 | ||
1564 | /* We may wish to put some error checking if type NSSA comes in | |
1565 | and area not in NSSA mode */ | |
1566 | switch (lsah->type) | |
1567 | { | |
1568 | case OSPF_AS_EXTERNAL_LSA: | |
1569 | #ifdef HAVE_OPAQUE_LSA | |
1570 | case OSPF_OPAQUE_AS_LSA: | |
1571 | lsa->area = NULL; | |
1572 | break; | |
1573 | case OSPF_OPAQUE_LINK_LSA: | |
1574 | lsa->oi = oi; /* Remember incoming interface for flooding control. */ | |
1575 | /* Fallthrough */ | |
1576 | #endif /* HAVE_OPAQUE_LSA */ | |
1577 | default: | |
1578 | lsa->area = oi->area; | |
1579 | break; | |
1580 | } | |
1581 | ||
1582 | lsa->data = ospf_lsa_data_new (length); | |
1583 | memcpy (lsa->data, lsah, length); | |
1584 | ||
1585 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1586 | zlog_debug("LSA[Type%d:%s]: %p new LSA created with Link State Update", |
718e3744 | 1587 | lsa->data->type, inet_ntoa (lsa->data->id), lsa); |
1588 | listnode_add (lsas, lsa); | |
1589 | } | |
1590 | ||
1591 | return lsas; | |
1592 | } | |
1593 | ||
1594 | /* Cleanup Update list. */ | |
4dadc291 | 1595 | static void |
52dc7ee6 | 1596 | ospf_upd_list_clean (struct list *lsas) |
718e3744 | 1597 | { |
1eb8ef25 | 1598 | struct listnode *node, *nnode; |
718e3744 | 1599 | struct ospf_lsa *lsa; |
1600 | ||
1eb8ef25 | 1601 | for (ALL_LIST_ELEMENTS (lsas, node, nnode, lsa)) |
1602 | ospf_lsa_discard (lsa); | |
718e3744 | 1603 | |
1604 | list_delete (lsas); | |
1605 | } | |
1606 | ||
1607 | /* OSPF Link State Update message read -- RFC2328 Section 13. */ | |
4dadc291 | 1608 | static void |
718e3744 | 1609 | ospf_ls_upd (struct ip *iph, struct ospf_header *ospfh, |
1610 | struct stream *s, struct ospf_interface *oi, u_int16_t size) | |
1611 | { | |
1612 | struct ospf_neighbor *nbr; | |
52dc7ee6 | 1613 | struct list *lsas; |
1eb8ef25 | 1614 | struct listnode *node, *nnode; |
718e3744 | 1615 | struct ospf_lsa *lsa = NULL; |
1616 | /* unsigned long ls_req_found = 0; */ | |
1617 | ||
1618 | /* Dis-assemble the stream, update each entry, re-encapsulate for flooding */ | |
1619 | ||
1620 | /* Increment statistics. */ | |
1621 | oi->ls_upd_in++; | |
1622 | ||
1623 | /* Check neighbor. */ | |
d3f0d621 | 1624 | nbr = ospf_nbr_lookup (oi, iph, ospfh); |
718e3744 | 1625 | if (nbr == NULL) |
1626 | { | |
1627 | zlog_warn ("Link State Update: Unknown Neighbor %s on int: %s", | |
1628 | inet_ntoa (ospfh->router_id), IF_NAME (oi)); | |
1629 | return; | |
1630 | } | |
1631 | ||
1632 | /* Check neighbor state. */ | |
1633 | if (nbr->state < NSM_Exchange) | |
1634 | { | |
3aa8d5f9 | 1635 | zlog_warn ("Link State Update: " |
1636 | "Neighbor[%s] state %s is less than Exchange", | |
1637 | inet_ntoa (ospfh->router_id), | |
1638 | LOOKUP(ospf_nsm_state_msg, nbr->state)); | |
718e3744 | 1639 | return; |
1640 | } | |
1641 | ||
1642 | /* Get list of LSAs from Link State Update packet. - Also perorms Stages | |
1643 | * 1 (validate LSA checksum) and 2 (check for LSA consistent type) | |
1644 | * of section 13. | |
1645 | */ | |
1646 | lsas = ospf_ls_upd_list_lsa (nbr, s, oi, size); | |
1647 | ||
1648 | #ifdef HAVE_OPAQUE_LSA | |
718e3744 | 1649 | /* |
1650 | * If self-originated Opaque-LSAs that have flooded before restart | |
1651 | * are contained in the received LSUpd message, corresponding LSReq | |
1652 | * messages to be sent may have to be modified. | |
1653 | * To eliminate possible race conditions such that flushing and normal | |
1654 | * updating for the same LSA would take place alternately, this trick | |
1655 | * must be done before entering to the loop below. | |
1656 | */ | |
69310a67 | 1657 | /* XXX: Why is this Opaque specific? Either our core code is deficient |
1658 | * and this should be fixed generally, or Opaque is inventing strawman | |
1659 | * problems */ | |
718e3744 | 1660 | ospf_opaque_adjust_lsreq (nbr, lsas); |
1661 | #endif /* HAVE_OPAQUE_LSA */ | |
1662 | ||
1663 | #define DISCARD_LSA(L,N) {\ | |
1664 | if (IS_DEBUG_OSPF_EVENT) \ | |
2a42e285 | 1665 | zlog_debug ("ospf_lsa_discard() in ospf_ls_upd() point %d: lsa %p Type-%d", N, lsa, (int) lsa->data->type); \ |
718e3744 | 1666 | ospf_lsa_discard (L); \ |
1667 | continue; } | |
1668 | ||
1669 | /* Process each LSA received in the one packet. */ | |
1eb8ef25 | 1670 | for (ALL_LIST_ELEMENTS (lsas, node, nnode, lsa)) |
718e3744 | 1671 | { |
1672 | struct ospf_lsa *ls_ret, *current; | |
1673 | int ret = 1; | |
1674 | ||
718e3744 | 1675 | if (IS_DEBUG_OSPF_NSSA) |
1676 | { | |
1677 | char buf1[INET_ADDRSTRLEN]; | |
1678 | char buf2[INET_ADDRSTRLEN]; | |
1679 | char buf3[INET_ADDRSTRLEN]; | |
1680 | ||
2a42e285 | 1681 | zlog_debug("LSA Type-%d from %s, ID: %s, ADV: %s", |
718e3744 | 1682 | lsa->data->type, |
1683 | inet_ntop (AF_INET, &ospfh->router_id, | |
1684 | buf1, INET_ADDRSTRLEN), | |
1685 | inet_ntop (AF_INET, &lsa->data->id, | |
1686 | buf2, INET_ADDRSTRLEN), | |
1687 | inet_ntop (AF_INET, &lsa->data->adv_router, | |
1688 | buf3, INET_ADDRSTRLEN)); | |
1689 | } | |
718e3744 | 1690 | |
1691 | listnode_delete (lsas, lsa); /* We don't need it in list anymore */ | |
1692 | ||
1693 | /* Validate Checksum - Done above by ospf_ls_upd_list_lsa() */ | |
1694 | ||
1695 | /* LSA Type - Done above by ospf_ls_upd_list_lsa() */ | |
1696 | ||
1697 | /* Do not take in AS External LSAs if we are a stub or NSSA. */ | |
1698 | ||
1699 | /* Do not take in AS NSSA if this neighbor and we are not NSSA */ | |
1700 | ||
1701 | /* Do take in Type-7's if we are an NSSA */ | |
1702 | ||
1703 | /* If we are also an ABR, later translate them to a Type-5 packet */ | |
1704 | ||
1705 | /* Later, an NSSA Re-fresh can Re-fresh Type-7's and an ABR will | |
1706 | translate them to a separate Type-5 packet. */ | |
1707 | ||
1708 | if (lsa->data->type == OSPF_AS_EXTERNAL_LSA) | |
1709 | /* Reject from STUB or NSSA */ | |
1710 | if (nbr->oi->area->external_routing != OSPF_AREA_DEFAULT) | |
1711 | { | |
1712 | DISCARD_LSA (lsa, 1); | |
718e3744 | 1713 | if (IS_DEBUG_OSPF_NSSA) |
2a42e285 | 1714 | zlog_debug("Incoming External LSA Discarded: We are NSSA/STUB Area"); |
718e3744 | 1715 | } |
1716 | ||
718e3744 | 1717 | if (lsa->data->type == OSPF_AS_NSSA_LSA) |
1718 | if (nbr->oi->area->external_routing != OSPF_AREA_NSSA) | |
1719 | { | |
1720 | DISCARD_LSA (lsa,2); | |
1721 | if (IS_DEBUG_OSPF_NSSA) | |
2a42e285 | 1722 | zlog_debug("Incoming NSSA LSA Discarded: Not NSSA Area"); |
718e3744 | 1723 | } |
718e3744 | 1724 | |
1725 | /* Find the LSA in the current database. */ | |
1726 | ||
1727 | current = ospf_lsa_lookup_by_header (oi->area, lsa->data); | |
1728 | ||
1729 | /* If the LSA's LS age is equal to MaxAge, and there is currently | |
1730 | no instance of the LSA in the router's link state database, | |
1731 | and none of router's neighbors are in states Exchange or Loading, | |
1732 | then take the following actions. */ | |
1733 | ||
1734 | if (IS_LSA_MAXAGE (lsa) && !current && | |
68980084 | 1735 | (ospf_nbr_count (oi, NSM_Exchange) + |
1736 | ospf_nbr_count (oi, NSM_Loading)) == 0) | |
718e3744 | 1737 | { |
1738 | /* Response Link State Acknowledgment. */ | |
1739 | ospf_ls_ack_send (nbr, lsa); | |
1740 | ||
1741 | /* Discard LSA. */ | |
6d45276f | 1742 | zlog_info ("Link State Update[%s]: LS age is equal to MaxAge.", |
1743 | dump_lsa_key(lsa)); | |
718e3744 | 1744 | DISCARD_LSA (lsa, 3); |
1745 | } | |
1746 | ||
1747 | #ifdef HAVE_OPAQUE_LSA | |
1748 | if (IS_OPAQUE_LSA (lsa->data->type) | |
68980084 | 1749 | && IPV4_ADDR_SAME (&lsa->data->adv_router, &oi->ospf->router_id)) |
718e3744 | 1750 | { |
1751 | /* | |
1752 | * Even if initial flushing seems to be completed, there might | |
1753 | * be a case that self-originated LSA with MaxAge still remain | |
1754 | * in the routing domain. | |
1755 | * Just send an LSAck message to cease retransmission. | |
1756 | */ | |
1757 | if (IS_LSA_MAXAGE (lsa)) | |
1758 | { | |
1759 | zlog_warn ("LSA[%s]: Boomerang effect?", dump_lsa_key (lsa)); | |
1760 | ospf_ls_ack_send (nbr, lsa); | |
1761 | ospf_lsa_discard (lsa); | |
1762 | ||
1763 | if (current != NULL && ! IS_LSA_MAXAGE (current)) | |
1764 | ospf_opaque_lsa_refresh_schedule (current); | |
1765 | continue; | |
1766 | } | |
1767 | ||
1768 | /* | |
1769 | * If an instance of self-originated Opaque-LSA is not found | |
1770 | * in the LSDB, there are some possible cases here. | |
1771 | * | |
1772 | * 1) This node lost opaque-capability after restart. | |
1773 | * 2) Else, a part of opaque-type is no more supported. | |
1774 | * 3) Else, a part of opaque-id is no more supported. | |
1775 | * | |
1776 | * Anyway, it is still this node's responsibility to flush it. | |
1777 | * Otherwise, the LSA instance remains in the routing domain | |
1778 | * until its age reaches to MaxAge. | |
1779 | */ | |
69310a67 | 1780 | /* XXX: We should deal with this for *ALL* LSAs, not just opaque */ |
718e3744 | 1781 | if (current == NULL) |
1782 | { | |
1783 | if (IS_DEBUG_OSPF_EVENT) | |
69310a67 | 1784 | zlog_debug ("LSA[%s]: Previously originated Opaque-LSA," |
1785 | "not found in the LSDB.", dump_lsa_key (lsa)); | |
718e3744 | 1786 | |
1787 | SET_FLAG (lsa->flags, OSPF_LSA_SELF); | |
69310a67 | 1788 | |
1789 | ospf_opaque_self_originated_lsa_received (nbr, lsa); | |
1790 | ospf_ls_ack_send (nbr, lsa); | |
1791 | ||
718e3744 | 1792 | continue; |
1793 | } | |
1794 | } | |
1795 | #endif /* HAVE_OPAQUE_LSA */ | |
69310a67 | 1796 | |
cb05eb28 | 1797 | /* It might be happen that received LSA is self-originated network LSA, but |
1798 | * router ID is cahnged. So, we should check if LSA is a network-LSA whose | |
1799 | * Link State ID is one of the router's own IP interface addresses but whose | |
1800 | * Advertising Router is not equal to the router's own Router ID | |
1801 | * According to RFC 2328 12.4.2 and 13.4 this LSA should be flushed. | |
1802 | */ | |
1803 | ||
1804 | if(lsa->data->type == OSPF_NETWORK_LSA) | |
1805 | { | |
1eb8ef25 | 1806 | struct listnode *oinode, *oinnode; |
1807 | struct ospf_interface *out_if; | |
cb05eb28 | 1808 | int Flag = 0; |
1809 | ||
1eb8ef25 | 1810 | for (ALL_LIST_ELEMENTS (oi->ospf->oiflist, oinode, oinnode, out_if)) |
cb05eb28 | 1811 | { |
cb05eb28 | 1812 | if(out_if == NULL) |
1813 | break; | |
1814 | ||
1815 | if((IPV4_ADDR_SAME(&out_if->address->u.prefix4, &lsa->data->id)) && | |
1816 | (!(IPV4_ADDR_SAME(&oi->ospf->router_id, &lsa->data->adv_router)))) | |
1817 | { | |
1818 | if(out_if->network_lsa_self) | |
1819 | { | |
1820 | ospf_lsa_flush_area(lsa,out_if->area); | |
1821 | if(IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 1822 | zlog_debug ("ospf_lsa_discard() in ospf_ls_upd() point 9: lsa %p Type-%d", |
cb05eb28 | 1823 | lsa, (int) lsa->data->type); |
1824 | ospf_lsa_discard (lsa); | |
1825 | Flag = 1; | |
1826 | } | |
1827 | break; | |
1828 | } | |
1829 | } | |
1830 | if(Flag) | |
1831 | continue; | |
1832 | } | |
718e3744 | 1833 | |
1834 | /* (5) Find the instance of this LSA that is currently contained | |
1835 | in the router's link state database. If there is no | |
1836 | database copy, or the received LSA is more recent than | |
1837 | the database copy the following steps must be performed. */ | |
1838 | ||
1839 | if (current == NULL || | |
1840 | (ret = ospf_lsa_more_recent (current, lsa)) < 0) | |
1841 | { | |
1842 | /* Actual flooding procedure. */ | |
68980084 | 1843 | if (ospf_flood (oi->ospf, nbr, current, lsa) < 0) /* Trap NSSA later. */ |
718e3744 | 1844 | DISCARD_LSA (lsa, 4); |
1845 | continue; | |
1846 | } | |
1847 | ||
1848 | /* (6) Else, If there is an instance of the LSA on the sending | |
1849 | neighbor's Link state request list, an error has occurred in | |
1850 | the Database Exchange process. In this case, restart the | |
1851 | Database Exchange process by generating the neighbor event | |
1852 | BadLSReq for the sending neighbor and stop processing the | |
1853 | Link State Update packet. */ | |
1854 | ||
1855 | if (ospf_ls_request_lookup (nbr, lsa)) | |
1856 | { | |
1857 | OSPF_NSM_EVENT_SCHEDULE (nbr, NSM_BadLSReq); | |
3aa8d5f9 | 1858 | zlog_warn("LSA[%s] instance exists on Link state request list", |
1859 | dump_lsa_key(lsa)); | |
718e3744 | 1860 | |
1861 | /* Clean list of LSAs. */ | |
1862 | ospf_upd_list_clean (lsas); | |
1863 | /* this lsa is not on lsas list already. */ | |
1864 | ospf_lsa_discard (lsa); | |
718e3744 | 1865 | return; |
1866 | } | |
1867 | ||
1868 | /* If the received LSA is the same instance as the database copy | |
1869 | (i.e., neither one is more recent) the following two steps | |
1870 | should be performed: */ | |
1871 | ||
1872 | if (ret == 0) | |
1873 | { | |
1874 | /* If the LSA is listed in the Link state retransmission list | |
1875 | for the receiving adjacency, the router itself is expecting | |
1876 | an acknowledgment for this LSA. The router should treat the | |
1877 | received LSA as an acknowledgment by removing the LSA from | |
1878 | the Link state retransmission list. This is termed an | |
1879 | "implied acknowledgment". */ | |
1880 | ||
1881 | ls_ret = ospf_ls_retransmit_lookup (nbr, lsa); | |
1882 | ||
1883 | if (ls_ret != NULL) | |
1884 | { | |
1885 | ospf_ls_retransmit_delete (nbr, ls_ret); | |
1886 | ||
1887 | /* Delayed acknowledgment sent if advertisement received | |
1888 | from Designated Router, otherwise do nothing. */ | |
1889 | if (oi->state == ISM_Backup) | |
1890 | if (NBR_IS_DR (nbr)) | |
1891 | listnode_add (oi->ls_ack, ospf_lsa_lock (lsa)); | |
1892 | ||
1893 | DISCARD_LSA (lsa, 5); | |
1894 | } | |
1895 | else | |
1896 | /* Acknowledge the receipt of the LSA by sending a | |
1897 | Link State Acknowledgment packet back out the receiving | |
1898 | interface. */ | |
1899 | { | |
1900 | ospf_ls_ack_send (nbr, lsa); | |
1901 | DISCARD_LSA (lsa, 6); | |
1902 | } | |
1903 | } | |
1904 | ||
1905 | /* The database copy is more recent. If the database copy | |
1906 | has LS age equal to MaxAge and LS sequence number equal to | |
1907 | MaxSequenceNumber, simply discard the received LSA without | |
1908 | acknowledging it. (In this case, the LSA's LS sequence number is | |
1909 | wrapping, and the MaxSequenceNumber LSA must be completely | |
1910 | flushed before any new LSA instance can be introduced). */ | |
1911 | ||
1912 | else if (ret > 0) /* Database copy is more recent */ | |
1913 | { | |
1914 | if (IS_LSA_MAXAGE (current) && | |
1915 | current->data->ls_seqnum == htonl (OSPF_MAX_SEQUENCE_NUMBER)) | |
1916 | { | |
1917 | DISCARD_LSA (lsa, 7); | |
1918 | } | |
1919 | /* Otherwise, as long as the database copy has not been sent in a | |
1920 | Link State Update within the last MinLSArrival seconds, send the | |
1921 | database copy back to the sending neighbor, encapsulated within | |
1922 | a Link State Update Packet. The Link State Update Packet should | |
1923 | be sent directly to the neighbor. In so doing, do not put the | |
1924 | database copy of the LSA on the neighbor's link state | |
1925 | retransmission list, and do not acknowledge the received (less | |
1926 | recent) LSA instance. */ | |
1927 | else | |
1928 | { | |
1929 | struct timeval now; | |
1930 | ||
1931 | gettimeofday (&now, NULL); | |
1932 | ||
1933 | if (tv_cmp (tv_sub (now, current->tv_orig), | |
1934 | int2tv (OSPF_MIN_LS_ARRIVAL)) > 0) | |
1935 | /* Trap NSSA type later.*/ | |
1936 | ospf_ls_upd_send_lsa (nbr, current, OSPF_SEND_PACKET_DIRECT); | |
1937 | DISCARD_LSA (lsa, 8); | |
1938 | } | |
1939 | } | |
1940 | } | |
1941 | ||
718e3744 | 1942 | assert (listcount (lsas) == 0); |
1943 | list_delete (lsas); | |
1944 | } | |
1945 | ||
1946 | /* OSPF Link State Acknowledgment message read -- RFC2328 Section 13.7. */ | |
4dadc291 | 1947 | static void |
718e3744 | 1948 | ospf_ls_ack (struct ip *iph, struct ospf_header *ospfh, |
1949 | struct stream *s, struct ospf_interface *oi, u_int16_t size) | |
1950 | { | |
1951 | struct ospf_neighbor *nbr; | |
69310a67 | 1952 | |
718e3744 | 1953 | /* increment statistics. */ |
1954 | oi->ls_ack_in++; | |
1955 | ||
d3f0d621 | 1956 | nbr = ospf_nbr_lookup (oi, iph, ospfh); |
718e3744 | 1957 | if (nbr == NULL) |
1958 | { | |
1959 | zlog_warn ("Link State Acknowledgment: Unknown Neighbor %s.", | |
1960 | inet_ntoa (ospfh->router_id)); | |
1961 | return; | |
1962 | } | |
1963 | ||
1964 | if (nbr->state < NSM_Exchange) | |
1965 | { | |
3aa8d5f9 | 1966 | zlog_warn ("Link State Acknowledgment: " |
1967 | "Neighbor[%s] state %s is less than Exchange", | |
1968 | inet_ntoa (ospfh->router_id), | |
1969 | LOOKUP(ospf_nsm_state_msg, nbr->state)); | |
718e3744 | 1970 | return; |
1971 | } | |
69310a67 | 1972 | |
718e3744 | 1973 | while (size >= OSPF_LSA_HEADER_SIZE) |
1974 | { | |
1975 | struct ospf_lsa *lsa, *lsr; | |
1976 | ||
1977 | lsa = ospf_lsa_new (); | |
1978 | lsa->data = (struct lsa_header *) STREAM_PNT (s); | |
1979 | ||
1980 | /* lsah = (struct lsa_header *) STREAM_PNT (s); */ | |
1981 | size -= OSPF_LSA_HEADER_SIZE; | |
9985f83c | 1982 | stream_forward_getp (s, OSPF_LSA_HEADER_SIZE); |
718e3744 | 1983 | |
1984 | if (lsa->data->type < OSPF_MIN_LSA || lsa->data->type >= OSPF_MAX_LSA) | |
1985 | { | |
1986 | lsa->data = NULL; | |
1987 | ospf_lsa_discard (lsa); | |
1988 | continue; | |
1989 | } | |
1990 | ||
1991 | lsr = ospf_ls_retransmit_lookup (nbr, lsa); | |
1992 | ||
1993 | if (lsr != NULL && lsr->data->ls_seqnum == lsa->data->ls_seqnum) | |
1994 | { | |
1995 | #ifdef HAVE_OPAQUE_LSA | |
718e3744 | 1996 | if (IS_OPAQUE_LSA (lsr->data->type)) |
69310a67 | 1997 | ospf_opaque_ls_ack_received (nbr, lsr); |
718e3744 | 1998 | #endif /* HAVE_OPAQUE_LSA */ |
1999 | ||
2000 | ospf_ls_retransmit_delete (nbr, lsr); | |
2001 | } | |
2002 | ||
2003 | lsa->data = NULL; | |
2004 | ospf_lsa_discard (lsa); | |
2005 | } | |
2006 | ||
718e3744 | 2007 | return; |
718e3744 | 2008 | } |
2009 | \f | |
038163fa | 2010 | static struct stream * |
5c33349b | 2011 | ospf_recv_packet (int fd, struct interface **ifp, struct stream *ibuf) |
718e3744 | 2012 | { |
2013 | int ret; | |
5c33349b | 2014 | struct ip *iph; |
718e3744 | 2015 | u_int16_t ip_len; |
718e3744 | 2016 | unsigned int ifindex = 0; |
2017 | struct iovec iov; | |
d0deca68 | 2018 | /* Header and data both require alignment. */ |
e304982e | 2019 | char buff [CMSG_SPACE(SOPT_SIZE_CMSG_IFINDEX_IPV4())]; |
2dd8bb4e | 2020 | struct msghdr msgh; |
2021 | ||
68defd6d | 2022 | memset (&msgh, 0, sizeof (struct msghdr)); |
2dd8bb4e | 2023 | msgh.msg_iov = &iov; |
2024 | msgh.msg_iovlen = 1; | |
2025 | msgh.msg_control = (caddr_t) buff; | |
2026 | msgh.msg_controllen = sizeof (buff); | |
2dd8bb4e | 2027 | |
5c33349b | 2028 | ret = stream_recvmsg (ibuf, fd, &msgh, 0, OSPF_MAX_PACKET_SIZE+1); |
2029 | if (ret < 0) | |
718e3744 | 2030 | { |
5c33349b | 2031 | zlog_warn("stream_recvmsg failed: %s", safe_strerror(errno)); |
2032 | return NULL; | |
2033 | } | |
69310a67 | 2034 | if ((unsigned int)ret < sizeof(iph)) /* ret must be > 0 now */ |
5c33349b | 2035 | { |
2036 | zlog_warn("ospf_recv_packet: discarding runt packet of length %d " | |
2037 | "(ip header size is %u)", | |
2038 | ret, (u_int)sizeof(iph)); | |
718e3744 | 2039 | return NULL; |
2040 | } | |
18b12c38 | 2041 | |
5c33349b | 2042 | /* Note that there should not be alignment problems with this assignment |
2043 | because this is at the beginning of the stream data buffer. */ | |
2044 | iph = (struct ip *) STREAM_DATA(ibuf); | |
2045 | sockopt_iphdrincl_swab_systoh (iph); | |
18b12c38 | 2046 | |
5c33349b | 2047 | ip_len = iph->ip_len; |
6b333611 | 2048 | |
239aecc0 | 2049 | #if !defined(GNU_LINUX) && (OpenBSD < 200311) |
718e3744 | 2050 | /* |
2051 | * Kernel network code touches incoming IP header parameters, | |
2052 | * before protocol specific processing. | |
2053 | * | |
2054 | * 1) Convert byteorder to host representation. | |
2055 | * --> ip_len, ip_id, ip_off | |
2056 | * | |
2057 | * 2) Adjust ip_len to strip IP header size! | |
2058 | * --> If user process receives entire IP packet via RAW | |
2059 | * socket, it must consider adding IP header size to | |
2060 | * the "ip_len" field of "ip" structure. | |
2061 | * | |
2062 | * For more details, see <netinet/ip_input.c>. | |
2063 | */ | |
5c33349b | 2064 | ip_len = ip_len + (iph->ip_hl << 2); |
718e3744 | 2065 | #endif |
2066 | ||
863082d5 | 2067 | ifindex = getsockopt_ifindex (AF_INET, &msgh); |
718e3744 | 2068 | |
2069 | *ifp = if_lookup_by_index (ifindex); | |
2070 | ||
2071 | if (ret != ip_len) | |
2072 | { | |
5c33349b | 2073 | zlog_warn ("ospf_recv_packet read length mismatch: ip_len is %d, " |
2074 | "but recvmsg returned %d", ip_len, ret); | |
718e3744 | 2075 | return NULL; |
2076 | } | |
2077 | ||
2078 | return ibuf; | |
2079 | } | |
2080 | ||
4dadc291 | 2081 | static struct ospf_interface * |
d3f0d621 | 2082 | ospf_associate_packet_vl (struct ospf *ospf, struct interface *ifp, |
718e3744 | 2083 | struct ip *iph, struct ospf_header *ospfh) |
2084 | { | |
2085 | struct ospf_interface *rcv_oi; | |
718e3744 | 2086 | struct ospf_vl_data *vl_data; |
2087 | struct ospf_area *vl_area; | |
52dc7ee6 | 2088 | struct listnode *node; |
718e3744 | 2089 | |
2090 | if (IN_MULTICAST (ntohl (iph->ip_dst.s_addr)) || | |
2091 | !OSPF_IS_AREA_BACKBONE (ospfh)) | |
d3f0d621 | 2092 | return NULL; |
718e3744 | 2093 | |
d3f0d621 | 2094 | /* look for local OSPF interface matching the destination |
2095 | * to determine Area ID. We presume therefore the destination address | |
2096 | * is unique, or at least (for "unnumbered" links), not used in other | |
2097 | * areas | |
2098 | */ | |
2099 | if ((rcv_oi = ospf_if_lookup_by_local_addr (ospf, NULL, | |
2100 | iph->ip_dst)) == NULL) | |
2101 | return NULL; | |
718e3744 | 2102 | |
1eb8ef25 | 2103 | for (ALL_LIST_ELEMENTS_RO (ospf->vlinks, node, vl_data)) |
718e3744 | 2104 | { |
020709f9 | 2105 | vl_area = ospf_area_lookup_by_area_id (ospf, vl_data->vl_area_id); |
718e3744 | 2106 | if (!vl_area) |
2107 | continue; | |
2108 | ||
2109 | if (OSPF_AREA_SAME (&vl_area, &rcv_oi->area) && | |
2110 | IPV4_ADDR_SAME (&vl_data->vl_peer, &ospfh->router_id)) | |
2111 | { | |
2112 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2113 | zlog_debug ("associating packet with %s", |
718e3744 | 2114 | IF_NAME (vl_data->vl_oi)); |
2115 | if (! CHECK_FLAG (vl_data->vl_oi->ifp->flags, IFF_UP)) | |
2116 | { | |
2117 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2118 | zlog_debug ("This VL is not up yet, sorry"); |
718e3744 | 2119 | return NULL; |
2120 | } | |
2121 | ||
2122 | return vl_data->vl_oi; | |
2123 | } | |
2124 | } | |
2125 | ||
2126 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2127 | zlog_debug ("couldn't find any VL to associate the packet with"); |
718e3744 | 2128 | |
d3f0d621 | 2129 | return NULL; |
718e3744 | 2130 | } |
2131 | ||
4dadc291 | 2132 | static inline int |
718e3744 | 2133 | ospf_check_area_id (struct ospf_interface *oi, struct ospf_header *ospfh) |
2134 | { | |
2135 | /* Check match the Area ID of the receiving interface. */ | |
2136 | if (OSPF_AREA_SAME (&oi->area, &ospfh)) | |
2137 | return 1; | |
2138 | ||
2139 | return 0; | |
2140 | } | |
2141 | ||
2142 | /* Unbound socket will accept any Raw IP packets if proto is matched. | |
2143 | To prevent it, compare src IP address and i/f address with masking | |
2144 | i/f network mask. */ | |
4dadc291 | 2145 | static int |
718e3744 | 2146 | ospf_check_network_mask (struct ospf_interface *oi, struct in_addr ip_src) |
2147 | { | |
2148 | struct in_addr mask, me, him; | |
2149 | ||
2150 | if (oi->type == OSPF_IFTYPE_POINTOPOINT || | |
2151 | oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
2152 | return 1; | |
2153 | ||
2154 | masklen2ip (oi->address->prefixlen, &mask); | |
2155 | ||
2156 | me.s_addr = oi->address->u.prefix4.s_addr & mask.s_addr; | |
2157 | him.s_addr = ip_src.s_addr & mask.s_addr; | |
2158 | ||
2159 | if (IPV4_ADDR_SAME (&me, &him)) | |
2160 | return 1; | |
2161 | ||
2162 | return 0; | |
2163 | } | |
2164 | ||
4dadc291 | 2165 | static int |
718e3744 | 2166 | ospf_check_auth (struct ospf_interface *oi, struct stream *ibuf, |
2167 | struct ospf_header *ospfh) | |
2168 | { | |
2169 | int ret = 0; | |
2170 | struct crypt_key *ck; | |
2171 | ||
2172 | switch (ntohs (ospfh->auth_type)) | |
2173 | { | |
2174 | case OSPF_AUTH_NULL: | |
2175 | ret = 1; | |
2176 | break; | |
2177 | case OSPF_AUTH_SIMPLE: | |
2178 | if (!memcmp (OSPF_IF_PARAM (oi, auth_simple), ospfh->u.auth_data, OSPF_AUTH_SIMPLE_SIZE)) | |
2179 | ret = 1; | |
2180 | else | |
2181 | ret = 0; | |
2182 | break; | |
2183 | case OSPF_AUTH_CRYPTOGRAPHIC: | |
1eb8ef25 | 2184 | if ((ck = listgetdata (listtail(OSPF_IF_PARAM (oi,auth_crypt)))) == NULL) |
718e3744 | 2185 | { |
2186 | ret = 0; | |
2187 | break; | |
2188 | } | |
2189 | ||
2190 | /* This is very basic, the digest processing is elsewhere */ | |
2191 | if (ospfh->u.crypt.auth_data_len == OSPF_AUTH_MD5_SIZE && | |
2192 | ospfh->u.crypt.key_id == ck->key_id && | |
2193 | ntohs (ospfh->length) + OSPF_AUTH_SIMPLE_SIZE <= stream_get_size (ibuf)) | |
2194 | ret = 1; | |
2195 | else | |
2196 | ret = 0; | |
2197 | break; | |
2198 | default: | |
2199 | ret = 0; | |
2200 | break; | |
2201 | } | |
2202 | ||
2203 | return ret; | |
2204 | } | |
2205 | ||
4dadc291 | 2206 | static int |
718e3744 | 2207 | ospf_check_sum (struct ospf_header *ospfh) |
2208 | { | |
2209 | u_int32_t ret; | |
2210 | u_int16_t sum; | |
718e3744 | 2211 | |
2212 | /* clear auth_data for checksum. */ | |
2213 | memset (ospfh->u.auth_data, 0, OSPF_AUTH_SIMPLE_SIZE); | |
2214 | ||
2215 | /* keep checksum and clear. */ | |
2216 | sum = ospfh->checksum; | |
2217 | memset (&ospfh->checksum, 0, sizeof (u_int16_t)); | |
2218 | ||
2219 | /* calculate checksum. */ | |
2220 | ret = in_cksum (ospfh, ntohs (ospfh->length)); | |
2221 | ||
2222 | if (ret != sum) | |
2223 | { | |
2224 | zlog_info ("ospf_check_sum(): checksum mismatch, my %X, his %X", | |
2225 | ret, sum); | |
2226 | return 0; | |
2227 | } | |
2228 | ||
2229 | return 1; | |
2230 | } | |
2231 | ||
2232 | /* OSPF Header verification. */ | |
4dadc291 | 2233 | static int |
718e3744 | 2234 | ospf_verify_header (struct stream *ibuf, struct ospf_interface *oi, |
2235 | struct ip *iph, struct ospf_header *ospfh) | |
2236 | { | |
2237 | /* check version. */ | |
2238 | if (ospfh->version != OSPF_VERSION) | |
2239 | { | |
2240 | zlog_warn ("interface %s: ospf_read version number mismatch.", | |
2241 | IF_NAME (oi)); | |
2242 | return -1; | |
2243 | } | |
2244 | ||
2245 | /* Check Area ID. */ | |
2246 | if (!ospf_check_area_id (oi, ospfh)) | |
2247 | { | |
2248 | zlog_warn ("interface %s: ospf_read invalid Area ID %s.", | |
2249 | IF_NAME (oi), inet_ntoa (ospfh->area_id)); | |
2250 | return -1; | |
2251 | } | |
2252 | ||
2253 | /* Check network mask, Silently discarded. */ | |
2254 | if (! ospf_check_network_mask (oi, iph->ip_src)) | |
2255 | { | |
2256 | zlog_warn ("interface %s: ospf_read network address is not same [%s]", | |
2257 | IF_NAME (oi), inet_ntoa (iph->ip_src)); | |
2258 | return -1; | |
2259 | } | |
2260 | ||
2261 | /* Check authentication. */ | |
2262 | if (ospf_auth_type (oi) != ntohs (ospfh->auth_type)) | |
2263 | { | |
c6371718 | 2264 | zlog_warn ("interface %s: auth-type mismatch, local %d, rcvd %d", |
2265 | IF_NAME (oi), ospf_auth_type (oi), ntohs (ospfh->auth_type)); | |
718e3744 | 2266 | return -1; |
2267 | } | |
2268 | ||
2269 | if (! ospf_check_auth (oi, ibuf, ospfh)) | |
2270 | { | |
2271 | zlog_warn ("interface %s: ospf_read authentication failed.", | |
2272 | IF_NAME (oi)); | |
2273 | return -1; | |
2274 | } | |
2275 | ||
2276 | /* if check sum is invalid, packet is discarded. */ | |
2277 | if (ntohs (ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
2278 | { | |
2279 | if (! ospf_check_sum (ospfh)) | |
2280 | { | |
2281 | zlog_warn ("interface %s: ospf_read packet checksum error %s", | |
2282 | IF_NAME (oi), inet_ntoa (ospfh->router_id)); | |
2283 | return -1; | |
2284 | } | |
2285 | } | |
2286 | else | |
2287 | { | |
2288 | if (ospfh->checksum != 0) | |
2289 | return -1; | |
2290 | if (ospf_check_md5_digest (oi, ibuf, ntohs (ospfh->length)) == 0) | |
2291 | { | |
2292 | zlog_warn ("interface %s: ospf_read md5 authentication failed.", | |
2293 | IF_NAME (oi)); | |
2294 | return -1; | |
2295 | } | |
2296 | } | |
2297 | ||
2298 | return 0; | |
2299 | } | |
2300 | ||
2301 | /* Starting point of packet process function. */ | |
2302 | int | |
2303 | ospf_read (struct thread *thread) | |
2304 | { | |
2305 | int ret; | |
2306 | struct stream *ibuf; | |
68980084 | 2307 | struct ospf *ospf; |
718e3744 | 2308 | struct ospf_interface *oi; |
2309 | struct ip *iph; | |
2310 | struct ospf_header *ospfh; | |
2311 | u_int16_t length; | |
2312 | struct interface *ifp; | |
2313 | ||
2314 | /* first of all get interface pointer. */ | |
68980084 | 2315 | ospf = THREAD_ARG (thread); |
038163fa | 2316 | |
2317 | /* prepare for next packet. */ | |
2318 | ospf->t_read = thread_add_read (master, ospf_read, ospf, ospf->fd); | |
718e3744 | 2319 | |
2320 | /* read OSPF packet. */ | |
5c33349b | 2321 | stream_reset(ospf->ibuf); |
2322 | if (!(ibuf = ospf_recv_packet (ospf->fd, &ifp, ospf->ibuf))) | |
718e3744 | 2323 | return -1; |
2324 | ||
5c33349b | 2325 | /* Note that there should not be alignment problems with this assignment |
2326 | because this is at the beginning of the stream data buffer. */ | |
06f953f7 | 2327 | iph = (struct ip *) STREAM_DATA (ibuf); |
5c33349b | 2328 | /* Note that sockopt_iphdrincl_swab_systoh was called in ospf_recv_packet. */ |
06f953f7 | 2329 | |
ac191232 | 2330 | if (ifp == NULL) |
b87f772a | 2331 | /* Handle cases where the platform does not support retrieving the ifindex, |
2332 | and also platforms (such as Solaris 8) that claim to support ifindex | |
2333 | retrieval but do not. */ | |
ac191232 | 2334 | ifp = if_lookup_address (iph->ip_src); |
ac191232 | 2335 | |
d3f0d621 | 2336 | if (ifp == NULL) |
5c33349b | 2337 | return 0; |
718e3744 | 2338 | |
2339 | /* IP Header dump. */ | |
17b78d38 | 2340 | if (IS_DEBUG_OSPF_PACKET(0, RECV)) |
6b333611 | 2341 | ospf_ip_header_dump (iph); |
7d95c611 | 2342 | |
718e3744 | 2343 | /* Self-originated packet should be discarded silently. */ |
68980084 | 2344 | if (ospf_if_lookup_by_local_addr (ospf, NULL, iph->ip_src)) |
718e3744 | 2345 | { |
d324181c | 2346 | if (IS_DEBUG_OSPF_PACKET (0, RECV)) |
2347 | { | |
2a42e285 | 2348 | zlog_debug ("ospf_read[%s]: Dropping self-originated packet", |
d324181c | 2349 | inet_ntoa (iph->ip_src)); |
2350 | } | |
718e3744 | 2351 | return 0; |
2352 | } | |
2353 | ||
2354 | /* Adjust size to message length. */ | |
9985f83c | 2355 | stream_forward_getp (ibuf, iph->ip_hl * 4); |
718e3744 | 2356 | |
2357 | /* Get ospf packet header. */ | |
2358 | ospfh = (struct ospf_header *) STREAM_PNT (ibuf); | |
2359 | ||
2360 | /* associate packet with ospf interface */ | |
68980084 | 2361 | oi = ospf_if_lookup_recv_if (ospf, iph->ip_src); |
d3f0d621 | 2362 | |
2363 | /* if no local ospf_interface, | |
2364 | * or header area is backbone but ospf_interface is not | |
2365 | * check for VLINK interface | |
2366 | */ | |
2367 | if ( (oi == NULL) || | |
2368 | (OSPF_IS_AREA_ID_BACKBONE(ospfh->area_id) | |
2369 | && !OSPF_IS_AREA_ID_BACKBONE(oi->area->area_id)) | |
2370 | ) | |
718e3744 | 2371 | { |
d3f0d621 | 2372 | if ((oi = ospf_associate_packet_vl (ospf, ifp, iph, ospfh)) == NULL) |
d324181c | 2373 | { |
88871b1d PJ |
2374 | if (IS_DEBUG_OSPF_EVENT) |
2375 | zlog_debug ("Packet from [%s] received on link %s" | |
2376 | " but no ospf_interface", | |
2377 | inet_ntoa (iph->ip_src), ifp->name); | |
d3f0d621 | 2378 | return 0; |
d324181c | 2379 | } |
d3f0d621 | 2380 | } |
2381 | ||
2382 | /* else it must be a local ospf interface, check it was received on | |
2383 | * correct link | |
2384 | */ | |
2385 | else if (oi->ifp != ifp) | |
2386 | { | |
2387 | zlog_warn ("Packet from [%s] received on wrong link %s", | |
2388 | inet_ntoa (iph->ip_src), ifp->name); | |
718e3744 | 2389 | return 0; |
2390 | } | |
847947f2 | 2391 | else if (oi->state == ISM_Down) |
c3eab871 | 2392 | { |
ba6454ec | 2393 | char buf[2][INET_ADDRSTRLEN]; |
2394 | zlog_warn ("Ignoring packet from %s to %s received on interface that is " | |
847947f2 | 2395 | "down [%s]; interface flags are %s", |
ba6454ec | 2396 | inet_ntop(AF_INET, &iph->ip_src, buf[0], sizeof(buf[0])), |
2397 | inet_ntop(AF_INET, &iph->ip_dst, buf[1], sizeof(buf[1])), | |
2398 | ifp->name, if_flag_dump(ifp->flags)); | |
ba6454ec | 2399 | /* Fix multicast memberships? */ |
2400 | if (iph->ip_dst.s_addr == htonl(OSPF_ALLSPFROUTERS)) | |
429ac78c | 2401 | OI_MEMBER_JOINED(oi, MEMBER_ALLROUTERS); |
ba6454ec | 2402 | else if (iph->ip_dst.s_addr == htonl(OSPF_ALLDROUTERS)) |
429ac78c | 2403 | OI_MEMBER_JOINED(oi, MEMBER_DROUTERS); |
ba6454ec | 2404 | if (oi->multicast_memberships) |
2405 | ospf_if_set_multicast(oi); | |
c3eab871 | 2406 | return 0; |
2407 | } | |
718e3744 | 2408 | |
2409 | /* | |
2410 | * If the received packet is destined for AllDRouters, the packet | |
2411 | * should be accepted only if the received ospf interface state is | |
2412 | * either DR or Backup -- endo. | |
2413 | */ | |
2414 | if (iph->ip_dst.s_addr == htonl (OSPF_ALLDROUTERS) | |
2415 | && (oi->state != ISM_DR && oi->state != ISM_Backup)) | |
2416 | { | |
ba6454ec | 2417 | zlog_warn ("Dropping packet for AllDRouters from [%s] via [%s] (ISM: %s)", |
718e3744 | 2418 | inet_ntoa (iph->ip_src), IF_NAME (oi), |
2419 | LOOKUP (ospf_ism_state_msg, oi->state)); | |
ba6454ec | 2420 | /* Try to fix multicast membership. */ |
2421 | SET_FLAG(oi->multicast_memberships, MEMBER_DROUTERS); | |
2422 | ospf_if_set_multicast(oi); | |
718e3744 | 2423 | return 0; |
2424 | } | |
2425 | ||
2426 | /* Show debug receiving packet. */ | |
1aa7b399 | 2427 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) |
2428 | { | |
718e3744 | 2429 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, DETAIL)) |
1aa7b399 | 2430 | { |
2a42e285 | 2431 | zlog_debug ("-----------------------------------------------------"); |
1aa7b399 | 2432 | ospf_packet_dump (ibuf); |
2433 | } | |
718e3744 | 2434 | |
2a42e285 | 2435 | zlog_debug ("%s received from [%s] via [%s]", |
1aa7b399 | 2436 | ospf_packet_type_str[ospfh->type], |
2437 | inet_ntoa (ospfh->router_id), IF_NAME (oi)); | |
2a42e285 | 2438 | zlog_debug (" src [%s],", inet_ntoa (iph->ip_src)); |
2439 | zlog_debug (" dst [%s]", inet_ntoa (iph->ip_dst)); | |
718e3744 | 2440 | |
2441 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, DETAIL)) | |
2a42e285 | 2442 | zlog_debug ("-----------------------------------------------------"); |
1aa7b399 | 2443 | } |
718e3744 | 2444 | |
2445 | /* Some header verification. */ | |
2446 | ret = ospf_verify_header (ibuf, oi, iph, ospfh); | |
2447 | if (ret < 0) | |
2448 | { | |
d324181c | 2449 | if (IS_DEBUG_OSPF_PACKET (ospfh->type - 1, RECV)) |
2450 | { | |
2a42e285 | 2451 | zlog_debug ("ospf_read[%s/%s]: Header check failed, " |
d324181c | 2452 | "dropping.", |
2453 | ospf_packet_type_str[ospfh->type], | |
2454 | inet_ntoa (iph->ip_src)); | |
2455 | } | |
718e3744 | 2456 | return ret; |
2457 | } | |
2458 | ||
9985f83c | 2459 | stream_forward_getp (ibuf, OSPF_HEADER_SIZE); |
718e3744 | 2460 | |
2461 | /* Adjust size to message length. */ | |
2462 | length = ntohs (ospfh->length) - OSPF_HEADER_SIZE; | |
2463 | ||
2464 | /* Read rest of the packet and call each sort of packet routine. */ | |
2465 | switch (ospfh->type) | |
2466 | { | |
2467 | case OSPF_MSG_HELLO: | |
2468 | ospf_hello (iph, ospfh, ibuf, oi, length); | |
2469 | break; | |
2470 | case OSPF_MSG_DB_DESC: | |
2471 | ospf_db_desc (iph, ospfh, ibuf, oi, length); | |
2472 | break; | |
2473 | case OSPF_MSG_LS_REQ: | |
2474 | ospf_ls_req (iph, ospfh, ibuf, oi, length); | |
2475 | break; | |
2476 | case OSPF_MSG_LS_UPD: | |
2477 | ospf_ls_upd (iph, ospfh, ibuf, oi, length); | |
2478 | break; | |
2479 | case OSPF_MSG_LS_ACK: | |
2480 | ospf_ls_ack (iph, ospfh, ibuf, oi, length); | |
2481 | break; | |
2482 | default: | |
2483 | zlog (NULL, LOG_WARNING, | |
2484 | "interface %s: OSPF packet header type %d is illegal", | |
2485 | IF_NAME (oi), ospfh->type); | |
2486 | break; | |
2487 | } | |
2488 | ||
718e3744 | 2489 | return 0; |
2490 | } | |
2491 | ||
2492 | /* Make OSPF header. */ | |
4dadc291 | 2493 | static void |
718e3744 | 2494 | ospf_make_header (int type, struct ospf_interface *oi, struct stream *s) |
2495 | { | |
2496 | struct ospf_header *ospfh; | |
2497 | ||
2498 | ospfh = (struct ospf_header *) STREAM_DATA (s); | |
2499 | ||
2500 | ospfh->version = (u_char) OSPF_VERSION; | |
2501 | ospfh->type = (u_char) type; | |
2502 | ||
68980084 | 2503 | ospfh->router_id = oi->ospf->router_id; |
718e3744 | 2504 | |
2505 | ospfh->checksum = 0; | |
2506 | ospfh->area_id = oi->area->area_id; | |
2507 | ospfh->auth_type = htons (ospf_auth_type (oi)); | |
2508 | ||
2509 | memset (ospfh->u.auth_data, 0, OSPF_AUTH_SIMPLE_SIZE); | |
2510 | ||
9985f83c | 2511 | stream_forward_endp (s, OSPF_HEADER_SIZE); |
718e3744 | 2512 | } |
2513 | ||
2514 | /* Make Authentication Data. */ | |
4dadc291 | 2515 | static int |
718e3744 | 2516 | ospf_make_auth (struct ospf_interface *oi, struct ospf_header *ospfh) |
2517 | { | |
2518 | struct crypt_key *ck; | |
2519 | ||
2520 | switch (ospf_auth_type (oi)) | |
2521 | { | |
2522 | case OSPF_AUTH_NULL: | |
2523 | /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data)); */ | |
2524 | break; | |
2525 | case OSPF_AUTH_SIMPLE: | |
2526 | memcpy (ospfh->u.auth_data, OSPF_IF_PARAM (oi, auth_simple), | |
2527 | OSPF_AUTH_SIMPLE_SIZE); | |
2528 | break; | |
2529 | case OSPF_AUTH_CRYPTOGRAPHIC: | |
2530 | /* If key is not set, then set 0. */ | |
2531 | if (list_isempty (OSPF_IF_PARAM (oi, auth_crypt))) | |
2532 | { | |
2533 | ospfh->u.crypt.zero = 0; | |
2534 | ospfh->u.crypt.key_id = 0; | |
2535 | ospfh->u.crypt.auth_data_len = OSPF_AUTH_MD5_SIZE; | |
2536 | } | |
2537 | else | |
2538 | { | |
1eb8ef25 | 2539 | ck = listgetdata (listtail(OSPF_IF_PARAM (oi, auth_crypt))); |
718e3744 | 2540 | ospfh->u.crypt.zero = 0; |
2541 | ospfh->u.crypt.key_id = ck->key_id; | |
2542 | ospfh->u.crypt.auth_data_len = OSPF_AUTH_MD5_SIZE; | |
2543 | } | |
2544 | /* note: the seq is done in ospf_make_md5_digest() */ | |
2545 | break; | |
2546 | default: | |
2547 | /* memset (ospfh->u.auth_data, 0, sizeof (ospfh->u.auth_data)); */ | |
2548 | break; | |
2549 | } | |
2550 | ||
2551 | return 0; | |
2552 | } | |
2553 | ||
2554 | /* Fill rest of OSPF header. */ | |
4dadc291 | 2555 | static void |
718e3744 | 2556 | ospf_fill_header (struct ospf_interface *oi, |
2557 | struct stream *s, u_int16_t length) | |
2558 | { | |
2559 | struct ospf_header *ospfh; | |
2560 | ||
2561 | ospfh = (struct ospf_header *) STREAM_DATA (s); | |
2562 | ||
2563 | /* Fill length. */ | |
2564 | ospfh->length = htons (length); | |
2565 | ||
2566 | /* Calculate checksum. */ | |
2567 | if (ntohs (ospfh->auth_type) != OSPF_AUTH_CRYPTOGRAPHIC) | |
2568 | ospfh->checksum = in_cksum (ospfh, length); | |
2569 | else | |
2570 | ospfh->checksum = 0; | |
2571 | ||
2572 | /* Add Authentication Data. */ | |
2573 | ospf_make_auth (oi, ospfh); | |
2574 | } | |
2575 | ||
4dadc291 | 2576 | static int |
718e3744 | 2577 | ospf_make_hello (struct ospf_interface *oi, struct stream *s) |
2578 | { | |
2579 | struct ospf_neighbor *nbr; | |
2580 | struct route_node *rn; | |
2581 | u_int16_t length = OSPF_HELLO_MIN_SIZE; | |
2582 | struct in_addr mask; | |
2583 | unsigned long p; | |
2584 | int flag = 0; | |
2585 | ||
2586 | /* Set netmask of interface. */ | |
2587 | if (oi->type != OSPF_IFTYPE_POINTOPOINT && | |
2588 | oi->type != OSPF_IFTYPE_VIRTUALLINK) | |
2589 | masklen2ip (oi->address->prefixlen, &mask); | |
2590 | else | |
2591 | memset ((char *) &mask, 0, sizeof (struct in_addr)); | |
2592 | stream_put_ipv4 (s, mask.s_addr); | |
2593 | ||
2594 | /* Set Hello Interval. */ | |
f9ad937f | 2595 | if (OSPF_IF_PARAM (oi, fast_hello) == 0) |
2596 | stream_putw (s, OSPF_IF_PARAM (oi, v_hello)); | |
2597 | else | |
2598 | stream_putw (s, 0); /* hello-interval of 0 for fast-hellos */ | |
718e3744 | 2599 | |
2600 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2601 | zlog_debug ("make_hello: options: %x, int: %s", |
718e3744 | 2602 | OPTIONS(oi), IF_NAME (oi)); |
2603 | ||
2604 | /* Set Options. */ | |
2605 | stream_putc (s, OPTIONS (oi)); | |
2606 | ||
2607 | /* Set Router Priority. */ | |
2608 | stream_putc (s, PRIORITY (oi)); | |
2609 | ||
2610 | /* Set Router Dead Interval. */ | |
2611 | stream_putl (s, OSPF_IF_PARAM (oi, v_wait)); | |
2612 | ||
2613 | /* Set Designated Router. */ | |
2614 | stream_put_ipv4 (s, DR (oi).s_addr); | |
2615 | ||
9985f83c | 2616 | p = stream_get_endp (s); |
718e3744 | 2617 | |
2618 | /* Set Backup Designated Router. */ | |
2619 | stream_put_ipv4 (s, BDR (oi).s_addr); | |
2620 | ||
2621 | /* Add neighbor seen. */ | |
2622 | for (rn = route_top (oi->nbrs); rn; rn = route_next (rn)) | |
68980084 | 2623 | if ((nbr = rn->info)) |
2624 | if (nbr->router_id.s_addr != 0) /* Ignore 0.0.0.0 node. */ | |
2625 | if (nbr->state != NSM_Attempt) /* Ignore Down neighbor. */ | |
2626 | if (nbr->state != NSM_Down) /* This is myself for DR election. */ | |
2627 | if (!IPV4_ADDR_SAME (&nbr->router_id, &oi->ospf->router_id)) | |
718e3744 | 2628 | { |
2629 | /* Check neighbor is sane? */ | |
68980084 | 2630 | if (nbr->d_router.s_addr != 0 |
2631 | && IPV4_ADDR_SAME (&nbr->d_router, &oi->address->u.prefix4) | |
2632 | && IPV4_ADDR_SAME (&nbr->bd_router, &oi->address->u.prefix4)) | |
2633 | flag = 1; | |
718e3744 | 2634 | |
2635 | stream_put_ipv4 (s, nbr->router_id.s_addr); | |
2636 | length += 4; | |
2637 | } | |
2638 | ||
2639 | /* Let neighbor generate BackupSeen. */ | |
2640 | if (flag == 1) | |
3a9eb091 | 2641 | stream_putl_at (s, p, 0); /* ipv4 address, normally */ |
718e3744 | 2642 | |
2643 | return length; | |
2644 | } | |
2645 | ||
4dadc291 | 2646 | static int |
718e3744 | 2647 | ospf_make_db_desc (struct ospf_interface *oi, struct ospf_neighbor *nbr, |
2648 | struct stream *s) | |
2649 | { | |
2650 | struct ospf_lsa *lsa; | |
2651 | u_int16_t length = OSPF_DB_DESC_MIN_SIZE; | |
2652 | u_char options; | |
2653 | unsigned long pp; | |
2654 | int i; | |
2655 | struct ospf_lsdb *lsdb; | |
2656 | ||
2657 | /* Set Interface MTU. */ | |
2658 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
2659 | stream_putw (s, 0); | |
2660 | else | |
2661 | stream_putw (s, oi->ifp->mtu); | |
2662 | ||
2663 | /* Set Options. */ | |
2664 | options = OPTIONS (oi); | |
2665 | #ifdef HAVE_OPAQUE_LSA | |
68980084 | 2666 | if (CHECK_FLAG (oi->ospf->config, OSPF_OPAQUE_CAPABLE)) |
718e3744 | 2667 | { |
2668 | if (IS_SET_DD_I (nbr->dd_flags) | |
2669 | || CHECK_FLAG (nbr->options, OSPF_OPTION_O)) | |
2670 | /* | |
2671 | * Set O-bit in the outgoing DD packet for capablity negotiation, | |
2672 | * if one of following case is applicable. | |
2673 | * | |
2674 | * 1) WaitTimer expiration event triggered the neighbor state to | |
2675 | * change to Exstart, but no (valid) DD packet has received | |
2676 | * from the neighbor yet. | |
2677 | * | |
2678 | * 2) At least one DD packet with O-bit on has received from the | |
2679 | * neighbor. | |
2680 | */ | |
2681 | SET_FLAG (options, OSPF_OPTION_O); | |
2682 | } | |
2683 | #endif /* HAVE_OPAQUE_LSA */ | |
2684 | stream_putc (s, options); | |
2685 | ||
8dd24ee6 | 2686 | /* DD flags */ |
9985f83c | 2687 | pp = stream_get_endp (s); |
718e3744 | 2688 | stream_putc (s, nbr->dd_flags); |
2689 | ||
2690 | /* Set DD Sequence Number. */ | |
2691 | stream_putl (s, nbr->dd_seqnum); | |
2692 | ||
2693 | if (ospf_db_summary_isempty (nbr)) | |
2694 | { | |
8dd24ee6 PJ |
2695 | /* Sanity check: |
2696 | * | |
2697 | * Must be here either: | |
2698 | * - Initial DBD (ospf_nsm.c) | |
2699 | * - M must be set | |
2700 | * or | |
2701 | * - finishing Exchange, and DB-Summary list empty | |
2702 | * - from ospf_db_desc_proc() | |
2703 | * - M must not be set | |
2704 | */ | |
718e3744 | 2705 | if (nbr->state >= NSM_Exchange) |
8dd24ee6 PJ |
2706 | assert (!IS_SET_DD_M(nbr->dd_flags)); |
2707 | else | |
2708 | assert (IS_SET_DD_M(nbr->dd_flags)); | |
2709 | ||
718e3744 | 2710 | return length; |
2711 | } | |
2712 | ||
2713 | /* Describe LSA Header from Database Summary List. */ | |
2714 | lsdb = &nbr->db_sum; | |
2715 | ||
2716 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) | |
2717 | { | |
2718 | struct route_table *table = lsdb->type[i].db; | |
2719 | struct route_node *rn; | |
2720 | ||
2721 | for (rn = route_top (table); rn; rn = route_next (rn)) | |
2722 | if ((lsa = rn->info) != NULL) | |
2723 | { | |
2724 | #ifdef HAVE_OPAQUE_LSA | |
2725 | if (IS_OPAQUE_LSA (lsa->data->type) | |
2726 | && (! CHECK_FLAG (options, OSPF_OPTION_O))) | |
2727 | { | |
2728 | /* Suppress advertising opaque-informations. */ | |
2729 | /* Remove LSA from DB summary list. */ | |
2730 | ospf_lsdb_delete (lsdb, lsa); | |
2731 | continue; | |
2732 | } | |
2733 | #endif /* HAVE_OPAQUE_LSA */ | |
2734 | ||
2735 | if (!CHECK_FLAG (lsa->flags, OSPF_LSA_DISCARD)) | |
2736 | { | |
2737 | struct lsa_header *lsah; | |
2738 | u_int16_t ls_age; | |
2739 | ||
2740 | /* DD packet overflows interface MTU. */ | |
86f1fd96 | 2741 | if (length + OSPF_LSA_HEADER_SIZE > ospf_packet_max (oi)) |
718e3744 | 2742 | break; |
2743 | ||
2744 | /* Keep pointer to LS age. */ | |
2745 | lsah = (struct lsa_header *) (STREAM_DATA (s) + | |
9985f83c | 2746 | stream_get_endp (s)); |
718e3744 | 2747 | |
2748 | /* Proceed stream pointer. */ | |
2749 | stream_put (s, lsa->data, OSPF_LSA_HEADER_SIZE); | |
2750 | length += OSPF_LSA_HEADER_SIZE; | |
2751 | ||
2752 | /* Set LS age. */ | |
2753 | ls_age = LS_AGE (lsa); | |
2754 | lsah->ls_age = htons (ls_age); | |
2755 | ||
2756 | } | |
2757 | ||
2758 | /* Remove LSA from DB summary list. */ | |
2759 | ospf_lsdb_delete (lsdb, lsa); | |
2760 | } | |
2761 | } | |
2762 | ||
8dd24ee6 PJ |
2763 | /* Update 'More' bit */ |
2764 | if (ospf_db_summary_isempty (nbr)) | |
2765 | { | |
2766 | UNSET_FLAG (nbr->dd_flags, OSPF_DD_FLAG_M); | |
2767 | /* Rewrite DD flags */ | |
2768 | stream_putc_at (s, pp, nbr->dd_flags); | |
2769 | } | |
718e3744 | 2770 | return length; |
2771 | } | |
2772 | ||
4dadc291 | 2773 | static int |
718e3744 | 2774 | ospf_make_ls_req_func (struct stream *s, u_int16_t *length, |
2775 | unsigned long delta, struct ospf_neighbor *nbr, | |
2776 | struct ospf_lsa *lsa) | |
2777 | { | |
2778 | struct ospf_interface *oi; | |
2779 | ||
2780 | oi = nbr->oi; | |
2781 | ||
2782 | /* LS Request packet overflows interface MTU. */ | |
86f1fd96 | 2783 | if (*length + delta > ospf_packet_max(oi)) |
718e3744 | 2784 | return 0; |
2785 | ||
2786 | stream_putl (s, lsa->data->type); | |
2787 | stream_put_ipv4 (s, lsa->data->id.s_addr); | |
2788 | stream_put_ipv4 (s, lsa->data->adv_router.s_addr); | |
2789 | ||
1fe6ed38 | 2790 | ospf_lsa_unlock (&nbr->ls_req_last); |
718e3744 | 2791 | nbr->ls_req_last = ospf_lsa_lock (lsa); |
2792 | ||
2793 | *length += 12; | |
2794 | return 1; | |
2795 | } | |
2796 | ||
4dadc291 | 2797 | static int |
718e3744 | 2798 | ospf_make_ls_req (struct ospf_neighbor *nbr, struct stream *s) |
2799 | { | |
2800 | struct ospf_lsa *lsa; | |
2801 | u_int16_t length = OSPF_LS_REQ_MIN_SIZE; | |
9985f83c | 2802 | unsigned long delta = stream_get_endp(s)+12; |
718e3744 | 2803 | struct route_table *table; |
2804 | struct route_node *rn; | |
2805 | int i; | |
2806 | struct ospf_lsdb *lsdb; | |
2807 | ||
2808 | lsdb = &nbr->ls_req; | |
2809 | ||
2810 | for (i = OSPF_MIN_LSA; i < OSPF_MAX_LSA; i++) | |
2811 | { | |
2812 | table = lsdb->type[i].db; | |
2813 | for (rn = route_top (table); rn; rn = route_next (rn)) | |
2814 | if ((lsa = (rn->info)) != NULL) | |
2815 | if (ospf_make_ls_req_func (s, &length, delta, nbr, lsa) == 0) | |
2816 | { | |
2817 | route_unlock_node (rn); | |
2818 | break; | |
2819 | } | |
2820 | } | |
2821 | return length; | |
2822 | } | |
2823 | ||
4dadc291 | 2824 | static int |
718e3744 | 2825 | ls_age_increment (struct ospf_lsa *lsa, int delay) |
2826 | { | |
2827 | int age; | |
2828 | ||
2829 | age = IS_LSA_MAXAGE (lsa) ? OSPF_LSA_MAXAGE : LS_AGE (lsa) + delay; | |
2830 | ||
2831 | return (age > OSPF_LSA_MAXAGE ? OSPF_LSA_MAXAGE : age); | |
2832 | } | |
2833 | ||
4dadc291 | 2834 | static int |
52dc7ee6 | 2835 | ospf_make_ls_upd (struct ospf_interface *oi, struct list *update, struct stream *s) |
718e3744 | 2836 | { |
2837 | struct ospf_lsa *lsa; | |
52dc7ee6 | 2838 | struct listnode *node; |
718e3744 | 2839 | u_int16_t length = OSPF_LS_UPD_MIN_SIZE; |
86f1fd96 | 2840 | unsigned int size_noauth; |
9985f83c | 2841 | unsigned long delta = stream_get_endp (s); |
718e3744 | 2842 | unsigned long pp; |
2843 | int count = 0; | |
2844 | ||
2845 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2846 | zlog_debug ("ospf_make_ls_upd: Start"); |
59ea14c6 | 2847 | |
9985f83c | 2848 | pp = stream_get_endp (s); |
2849 | stream_forward_endp (s, OSPF_LS_UPD_MIN_SIZE); | |
718e3744 | 2850 | |
86f1fd96 | 2851 | /* Calculate amount of packet usable for data. */ |
2852 | size_noauth = stream_get_size(s) - ospf_packet_authspace(oi); | |
2853 | ||
718e3744 | 2854 | while ((node = listhead (update)) != NULL) |
2855 | { | |
2856 | struct lsa_header *lsah; | |
2857 | u_int16_t ls_age; | |
2858 | ||
2859 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2860 | zlog_debug ("ospf_make_ls_upd: List Iteration"); |
718e3744 | 2861 | |
1eb8ef25 | 2862 | lsa = listgetdata (node); |
2863 | ||
718e3744 | 2864 | assert (lsa->data); |
2865 | ||
68b7339a | 2866 | /* Will it fit? */ |
86f1fd96 | 2867 | if (length + delta + ntohs (lsa->data->length) > size_noauth) |
59ea14c6 | 2868 | break; |
2869 | ||
718e3744 | 2870 | /* Keep pointer to LS age. */ |
9985f83c | 2871 | lsah = (struct lsa_header *) (STREAM_DATA (s) + stream_get_endp (s)); |
718e3744 | 2872 | |
2873 | /* Put LSA to Link State Request. */ | |
2874 | stream_put (s, lsa->data, ntohs (lsa->data->length)); | |
2875 | ||
2876 | /* Set LS age. */ | |
2877 | /* each hop must increment an lsa_age by transmit_delay | |
2878 | of OSPF interface */ | |
2879 | ls_age = ls_age_increment (lsa, OSPF_IF_PARAM (oi, transmit_delay)); | |
2880 | lsah->ls_age = htons (ls_age); | |
2881 | ||
2882 | length += ntohs (lsa->data->length); | |
2883 | count++; | |
2884 | ||
2885 | list_delete_node (update, node); | |
1fe6ed38 | 2886 | ospf_lsa_unlock (&lsa); /* oi->ls_upd_queue */ |
718e3744 | 2887 | } |
2888 | ||
2889 | /* Now set #LSAs. */ | |
3a9eb091 | 2890 | stream_putl_at (s, pp, count); |
718e3744 | 2891 | |
2892 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 2893 | zlog_debug ("ospf_make_ls_upd: Stop"); |
718e3744 | 2894 | return length; |
2895 | } | |
2896 | ||
4dadc291 | 2897 | static int |
52dc7ee6 | 2898 | ospf_make_ls_ack (struct ospf_interface *oi, struct list *ack, struct stream *s) |
718e3744 | 2899 | { |
1fe6ed38 | 2900 | struct listnode *node, *nnode; |
718e3744 | 2901 | u_int16_t length = OSPF_LS_ACK_MIN_SIZE; |
9985f83c | 2902 | unsigned long delta = stream_get_endp(s) + 24; |
718e3744 | 2903 | struct ospf_lsa *lsa; |
2904 | ||
1fe6ed38 | 2905 | for (ALL_LIST_ELEMENTS (ack, node, nnode, lsa)) |
718e3744 | 2906 | { |
718e3744 | 2907 | assert (lsa); |
2908 | ||
86f1fd96 | 2909 | if (length + delta > ospf_packet_max (oi)) |
718e3744 | 2910 | break; |
2911 | ||
2912 | stream_put (s, lsa->data, OSPF_LSA_HEADER_SIZE); | |
2913 | length += OSPF_LSA_HEADER_SIZE; | |
2914 | ||
718e3744 | 2915 | listnode_delete (ack, lsa); |
1fe6ed38 | 2916 | ospf_lsa_unlock (&lsa); /* oi->ls_ack_direct.ls_ack */ |
718e3744 | 2917 | } |
2918 | ||
718e3744 | 2919 | return length; |
2920 | } | |
2921 | ||
2922 | void | |
2923 | ospf_hello_send_sub (struct ospf_interface *oi, struct in_addr *addr) | |
2924 | { | |
2925 | struct ospf_packet *op; | |
2926 | u_int16_t length = OSPF_HEADER_SIZE; | |
2927 | ||
2928 | op = ospf_packet_new (oi->ifp->mtu); | |
2929 | ||
2930 | /* Prepare OSPF common header. */ | |
2931 | ospf_make_header (OSPF_MSG_HELLO, oi, op->s); | |
2932 | ||
2933 | /* Prepare OSPF Hello body. */ | |
2934 | length += ospf_make_hello (oi, op->s); | |
2935 | ||
2936 | /* Fill OSPF header. */ | |
2937 | ospf_fill_header (oi, op->s, length); | |
2938 | ||
2939 | /* Set packet length. */ | |
2940 | op->length = length; | |
2941 | ||
2942 | op->dst.s_addr = addr->s_addr; | |
2943 | ||
2944 | /* Add packet to the interface output queue. */ | |
2945 | ospf_packet_add (oi, op); | |
2946 | ||
2947 | /* Hook thread to write packet. */ | |
020709f9 | 2948 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 2949 | } |
2950 | ||
4dadc291 | 2951 | static void |
718e3744 | 2952 | ospf_poll_send (struct ospf_nbr_nbma *nbr_nbma) |
2953 | { | |
2954 | struct ospf_interface *oi; | |
2955 | ||
2956 | oi = nbr_nbma->oi; | |
2957 | assert(oi); | |
2958 | ||
2959 | /* If this is passive interface, do not send OSPF Hello. */ | |
2960 | if (OSPF_IF_PARAM (oi, passive_interface) == OSPF_IF_PASSIVE) | |
2961 | return; | |
2962 | ||
2963 | if (oi->type != OSPF_IFTYPE_NBMA) | |
2964 | return; | |
2965 | ||
2966 | if (nbr_nbma->nbr != NULL && nbr_nbma->nbr->state != NSM_Down) | |
2967 | return; | |
2968 | ||
2969 | if (PRIORITY(oi) == 0) | |
2970 | return; | |
2971 | ||
2972 | if (nbr_nbma->priority == 0 | |
2973 | && oi->state != ISM_DR && oi->state != ISM_Backup) | |
2974 | return; | |
2975 | ||
2976 | ospf_hello_send_sub (oi, &nbr_nbma->addr); | |
2977 | } | |
2978 | ||
2979 | int | |
2980 | ospf_poll_timer (struct thread *thread) | |
2981 | { | |
2982 | struct ospf_nbr_nbma *nbr_nbma; | |
2983 | ||
2984 | nbr_nbma = THREAD_ARG (thread); | |
2985 | nbr_nbma->t_poll = NULL; | |
2986 | ||
2987 | if (IS_DEBUG_OSPF (nsm, NSM_TIMERS)) | |
2a42e285 | 2988 | zlog (NULL, LOG_DEBUG, "NSM[%s:%s]: Timer (Poll timer expire)", |
718e3744 | 2989 | IF_NAME (nbr_nbma->oi), inet_ntoa (nbr_nbma->addr)); |
2990 | ||
2991 | ospf_poll_send (nbr_nbma); | |
2992 | ||
2993 | if (nbr_nbma->v_poll > 0) | |
2994 | OSPF_POLL_TIMER_ON (nbr_nbma->t_poll, ospf_poll_timer, | |
2995 | nbr_nbma->v_poll); | |
2996 | ||
2997 | return 0; | |
2998 | } | |
2999 | ||
3000 | ||
3001 | int | |
3002 | ospf_hello_reply_timer (struct thread *thread) | |
3003 | { | |
3004 | struct ospf_neighbor *nbr; | |
3005 | ||
3006 | nbr = THREAD_ARG (thread); | |
3007 | nbr->t_hello_reply = NULL; | |
3008 | ||
3009 | assert (nbr->oi); | |
3010 | ||
3011 | if (IS_DEBUG_OSPF (nsm, NSM_TIMERS)) | |
2a42e285 | 3012 | zlog (NULL, LOG_DEBUG, "NSM[%s:%s]: Timer (hello-reply timer expire)", |
718e3744 | 3013 | IF_NAME (nbr->oi), inet_ntoa (nbr->router_id)); |
3014 | ||
3015 | ospf_hello_send_sub (nbr->oi, &nbr->address.u.prefix4); | |
3016 | ||
3017 | return 0; | |
3018 | } | |
3019 | ||
3020 | /* Send OSPF Hello. */ | |
3021 | void | |
3022 | ospf_hello_send (struct ospf_interface *oi) | |
3023 | { | |
3024 | struct ospf_packet *op; | |
3025 | u_int16_t length = OSPF_HEADER_SIZE; | |
3026 | ||
3027 | /* If this is passive interface, do not send OSPF Hello. */ | |
3028 | if (OSPF_IF_PARAM (oi, passive_interface) == OSPF_IF_PASSIVE) | |
3029 | return; | |
3030 | ||
3031 | op = ospf_packet_new (oi->ifp->mtu); | |
3032 | ||
3033 | /* Prepare OSPF common header. */ | |
3034 | ospf_make_header (OSPF_MSG_HELLO, oi, op->s); | |
3035 | ||
3036 | /* Prepare OSPF Hello body. */ | |
3037 | length += ospf_make_hello (oi, op->s); | |
3038 | ||
3039 | /* Fill OSPF header. */ | |
3040 | ospf_fill_header (oi, op->s, length); | |
3041 | ||
3042 | /* Set packet length. */ | |
3043 | op->length = length; | |
3044 | ||
3045 | if (oi->type == OSPF_IFTYPE_NBMA) | |
3046 | { | |
3047 | struct ospf_neighbor *nbr; | |
3048 | struct route_node *rn; | |
3049 | ||
3050 | for (rn = route_top (oi->nbrs); rn; rn = route_next (rn)) | |
3051 | if ((nbr = rn->info)) | |
3052 | if (nbr != oi->nbr_self) | |
3053 | if (nbr->state != NSM_Down) | |
3054 | { | |
3055 | /* RFC 2328 Section 9.5.1 | |
3056 | If the router is not eligible to become Designated Router, | |
3057 | it must periodically send Hello Packets to both the | |
3058 | Designated Router and the Backup Designated Router (if they | |
3059 | exist). */ | |
3060 | if (PRIORITY(oi) == 0 && | |
3061 | IPV4_ADDR_CMP(&DR(oi), &nbr->address.u.prefix4) && | |
3062 | IPV4_ADDR_CMP(&BDR(oi), &nbr->address.u.prefix4)) | |
3063 | continue; | |
3064 | ||
3065 | /* If the router is eligible to become Designated Router, it | |
3066 | must periodically send Hello Packets to all neighbors that | |
3067 | are also eligible. In addition, if the router is itself the | |
3068 | Designated Router or Backup Designated Router, it must also | |
3069 | send periodic Hello Packets to all other neighbors. */ | |
3070 | ||
3071 | if (nbr->priority == 0 && oi->state == ISM_DROther) | |
3072 | continue; | |
3073 | /* if oi->state == Waiting, send hello to all neighbors */ | |
3074 | { | |
3075 | struct ospf_packet *op_dup; | |
3076 | ||
3077 | op_dup = ospf_packet_dup(op); | |
3078 | op_dup->dst = nbr->address.u.prefix4; | |
3079 | ||
3080 | /* Add packet to the interface output queue. */ | |
3081 | ospf_packet_add (oi, op_dup); | |
3082 | ||
020709f9 | 3083 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3084 | } |
3085 | ||
3086 | } | |
3087 | ospf_packet_free (op); | |
3088 | } | |
3089 | else | |
3090 | { | |
3091 | /* Decide destination address. */ | |
3092 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3093 | op->dst.s_addr = oi->vl_data->peer_addr.s_addr; | |
3094 | else | |
3095 | op->dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3096 | ||
3097 | /* Add packet to the interface output queue. */ | |
3098 | ospf_packet_add (oi, op); | |
3099 | ||
3100 | /* Hook thread to write packet. */ | |
020709f9 | 3101 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3102 | } |
3103 | } | |
3104 | ||
3105 | /* Send OSPF Database Description. */ | |
3106 | void | |
3107 | ospf_db_desc_send (struct ospf_neighbor *nbr) | |
3108 | { | |
3109 | struct ospf_interface *oi; | |
3110 | struct ospf_packet *op; | |
3111 | u_int16_t length = OSPF_HEADER_SIZE; | |
3112 | ||
3113 | oi = nbr->oi; | |
3114 | op = ospf_packet_new (oi->ifp->mtu); | |
3115 | ||
3116 | /* Prepare OSPF common header. */ | |
3117 | ospf_make_header (OSPF_MSG_DB_DESC, oi, op->s); | |
3118 | ||
3119 | /* Prepare OSPF Database Description body. */ | |
3120 | length += ospf_make_db_desc (oi, nbr, op->s); | |
3121 | ||
3122 | /* Fill OSPF header. */ | |
3123 | ospf_fill_header (oi, op->s, length); | |
3124 | ||
3125 | /* Set packet length. */ | |
3126 | op->length = length; | |
3127 | ||
3128 | /* Decide destination address. */ | |
3129 | op->dst = nbr->address.u.prefix4; | |
3130 | ||
3131 | /* Add packet to the interface output queue. */ | |
3132 | ospf_packet_add (oi, op); | |
3133 | ||
3134 | /* Hook thread to write packet. */ | |
020709f9 | 3135 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3136 | |
3137 | /* Remove old DD packet, then copy new one and keep in neighbor structure. */ | |
3138 | if (nbr->last_send) | |
3139 | ospf_packet_free (nbr->last_send); | |
3140 | nbr->last_send = ospf_packet_dup (op); | |
3141 | gettimeofday (&nbr->last_send_ts, NULL); | |
3142 | } | |
3143 | ||
3144 | /* Re-send Database Description. */ | |
3145 | void | |
3146 | ospf_db_desc_resend (struct ospf_neighbor *nbr) | |
3147 | { | |
3148 | struct ospf_interface *oi; | |
3149 | ||
3150 | oi = nbr->oi; | |
3151 | ||
3152 | /* Add packet to the interface output queue. */ | |
3153 | ospf_packet_add (oi, ospf_packet_dup (nbr->last_send)); | |
3154 | ||
3155 | /* Hook thread to write packet. */ | |
020709f9 | 3156 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3157 | } |
3158 | ||
3159 | /* Send Link State Request. */ | |
3160 | void | |
3161 | ospf_ls_req_send (struct ospf_neighbor *nbr) | |
3162 | { | |
3163 | struct ospf_interface *oi; | |
3164 | struct ospf_packet *op; | |
3165 | u_int16_t length = OSPF_HEADER_SIZE; | |
3166 | ||
3167 | oi = nbr->oi; | |
3168 | op = ospf_packet_new (oi->ifp->mtu); | |
3169 | ||
3170 | /* Prepare OSPF common header. */ | |
3171 | ospf_make_header (OSPF_MSG_LS_REQ, oi, op->s); | |
3172 | ||
3173 | /* Prepare OSPF Link State Request body. */ | |
3174 | length += ospf_make_ls_req (nbr, op->s); | |
3175 | if (length == OSPF_HEADER_SIZE) | |
3176 | { | |
3177 | ospf_packet_free (op); | |
3178 | return; | |
3179 | } | |
3180 | ||
3181 | /* Fill OSPF header. */ | |
3182 | ospf_fill_header (oi, op->s, length); | |
3183 | ||
3184 | /* Set packet length. */ | |
3185 | op->length = length; | |
3186 | ||
3187 | /* Decide destination address. */ | |
3188 | op->dst = nbr->address.u.prefix4; | |
3189 | ||
3190 | /* Add packet to the interface output queue. */ | |
3191 | ospf_packet_add (oi, op); | |
3192 | ||
3193 | /* Hook thread to write packet. */ | |
020709f9 | 3194 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3195 | |
3196 | /* Add Link State Request Retransmission Timer. */ | |
3197 | OSPF_NSM_TIMER_ON (nbr->t_ls_req, ospf_ls_req_timer, nbr->v_ls_req); | |
3198 | } | |
3199 | ||
3200 | /* Send Link State Update with an LSA. */ | |
3201 | void | |
3202 | ospf_ls_upd_send_lsa (struct ospf_neighbor *nbr, struct ospf_lsa *lsa, | |
3203 | int flag) | |
3204 | { | |
52dc7ee6 | 3205 | struct list *update; |
718e3744 | 3206 | |
3207 | update = list_new (); | |
3208 | ||
3209 | listnode_add (update, lsa); | |
3210 | ospf_ls_upd_send (nbr, update, flag); | |
3211 | ||
3212 | list_delete (update); | |
3213 | } | |
3214 | ||
68b7339a | 3215 | /* Determine size for packet. Must be at least big enough to accomodate next |
3216 | * LSA on list, which may be bigger than MTU size. | |
3217 | * | |
3218 | * Return pointer to new ospf_packet | |
3219 | * NULL if we can not allocate, eg because LSA is bigger than imposed limit | |
3220 | * on packet sizes (in which case offending LSA is deleted from update list) | |
3221 | */ | |
3222 | static struct ospf_packet * | |
3223 | ospf_ls_upd_packet_new (struct list *update, struct ospf_interface *oi) | |
3224 | { | |
3225 | struct ospf_lsa *lsa; | |
3226 | struct listnode *ln; | |
3227 | size_t size; | |
3228 | static char warned = 0; | |
3229 | ||
1eb8ef25 | 3230 | lsa = listgetdata((ln = listhead (update))); |
68b7339a | 3231 | assert (lsa->data); |
3232 | ||
3233 | if ((OSPF_LS_UPD_MIN_SIZE + ntohs (lsa->data->length)) | |
3234 | > ospf_packet_max (oi)) | |
3235 | { | |
3236 | if (!warned) | |
3237 | { | |
3238 | zlog_warn ("ospf_ls_upd_packet_new: oversized LSA encountered!" | |
3239 | "will need to fragment. Not optimal. Try divide up" | |
3240 | " your network with areas. Use 'debug ospf packet send'" | |
3241 | " to see details, or look at 'show ip ospf database ..'"); | |
3242 | warned = 1; | |
3243 | } | |
3244 | ||
3245 | if (IS_DEBUG_OSPF_PACKET (0, SEND)) | |
2a42e285 | 3246 | zlog_debug ("ospf_ls_upd_packet_new: oversized LSA id:%s," |
68b7339a | 3247 | " %d bytes originated by %s, will be fragmented!", |
3248 | inet_ntoa (lsa->data->id), | |
3249 | ntohs (lsa->data->length), | |
3250 | inet_ntoa (lsa->data->adv_router)); | |
3251 | ||
3252 | /* | |
3253 | * Allocate just enough to fit this LSA only, to avoid including other | |
3254 | * LSAs in fragmented LSA Updates. | |
3255 | */ | |
3256 | size = ntohs (lsa->data->length) + (oi->ifp->mtu - ospf_packet_max (oi)) | |
3257 | + OSPF_LS_UPD_MIN_SIZE; | |
3258 | } | |
3259 | else | |
3260 | size = oi->ifp->mtu; | |
3261 | ||
86f1fd96 | 3262 | /* XXX Should this be - sizeof(struct ip)?? -gdt */ |
68b7339a | 3263 | if (size > OSPF_MAX_PACKET_SIZE) |
3264 | { | |
3265 | zlog_warn ("ospf_ls_upd_packet_new: oversized LSA id:%s too big," | |
64511f39 | 3266 | " %d bytes, packet size %ld, dropping it completely." |
68b7339a | 3267 | " OSPF routing is broken!", |
37ccfa3d | 3268 | inet_ntoa (lsa->data->id), ntohs (lsa->data->length), |
62d8e96a | 3269 | (long int) size); |
68b7339a | 3270 | list_delete_node (update, ln); |
3271 | return NULL; | |
3272 | } | |
3273 | ||
3274 | return ospf_packet_new (size); | |
3275 | } | |
3276 | ||
718e3744 | 3277 | static void |
52dc7ee6 | 3278 | ospf_ls_upd_queue_send (struct ospf_interface *oi, struct list *update, |
718e3744 | 3279 | struct in_addr addr) |
3280 | { | |
3281 | struct ospf_packet *op; | |
3282 | u_int16_t length = OSPF_HEADER_SIZE; | |
3283 | ||
3284 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3285 | zlog_debug ("listcount = %d, dst %s", listcount (update), inet_ntoa(addr)); |
68b7339a | 3286 | |
3287 | op = ospf_ls_upd_packet_new (update, oi); | |
718e3744 | 3288 | |
3289 | /* Prepare OSPF common header. */ | |
3290 | ospf_make_header (OSPF_MSG_LS_UPD, oi, op->s); | |
3291 | ||
59ea14c6 | 3292 | /* Prepare OSPF Link State Update body. |
3293 | * Includes Type-7 translation. | |
3294 | */ | |
718e3744 | 3295 | length += ospf_make_ls_upd (oi, update, op->s); |
3296 | ||
3297 | /* Fill OSPF header. */ | |
3298 | ospf_fill_header (oi, op->s, length); | |
3299 | ||
3300 | /* Set packet length. */ | |
3301 | op->length = length; | |
3302 | ||
3303 | /* Decide destination address. */ | |
3304 | op->dst.s_addr = addr.s_addr; | |
3305 | ||
3306 | /* Add packet to the interface output queue. */ | |
3307 | ospf_packet_add (oi, op); | |
3308 | ||
3309 | /* Hook thread to write packet. */ | |
020709f9 | 3310 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3311 | } |
3312 | ||
3313 | static int | |
3314 | ospf_ls_upd_send_queue_event (struct thread *thread) | |
3315 | { | |
3316 | struct ospf_interface *oi = THREAD_ARG(thread); | |
3317 | struct route_node *rn; | |
736d3441 | 3318 | struct route_node *rnext; |
59ea14c6 | 3319 | struct list *update; |
68b7339a | 3320 | char again = 0; |
718e3744 | 3321 | |
3322 | oi->t_ls_upd_event = NULL; | |
3323 | ||
3324 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3325 | zlog_debug ("ospf_ls_upd_send_queue start"); |
718e3744 | 3326 | |
736d3441 | 3327 | for (rn = route_top (oi->ls_upd_queue); rn; rn = rnext) |
718e3744 | 3328 | { |
736d3441 | 3329 | rnext = route_next (rn); |
3330 | ||
718e3744 | 3331 | if (rn->info == NULL) |
736d3441 | 3332 | continue; |
68b7339a | 3333 | |
3334 | update = (struct list *)rn->info; | |
718e3744 | 3335 | |
48fe13bf | 3336 | ospf_ls_upd_queue_send (oi, update, rn->p.u.prefix4); |
718e3744 | 3337 | |
68b7339a | 3338 | /* list might not be empty. */ |
59ea14c6 | 3339 | if (listcount(update) == 0) |
3340 | { | |
3341 | list_delete (rn->info); | |
3342 | rn->info = NULL; | |
3343 | route_unlock_node (rn); | |
3344 | } | |
3345 | else | |
68b7339a | 3346 | again = 1; |
59ea14c6 | 3347 | } |
3348 | ||
3349 | if (again != 0) | |
3350 | { | |
3351 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3352 | zlog_debug ("ospf_ls_upd_send_queue: update lists not cleared," |
59ea14c6 | 3353 | " %d nodes to try again, raising new event", again); |
3354 | oi->t_ls_upd_event = | |
3355 | thread_add_event (master, ospf_ls_upd_send_queue_event, oi, 0); | |
718e3744 | 3356 | } |
3357 | ||
3358 | if (IS_DEBUG_OSPF_EVENT) | |
2a42e285 | 3359 | zlog_debug ("ospf_ls_upd_send_queue stop"); |
59ea14c6 | 3360 | |
718e3744 | 3361 | return 0; |
3362 | } | |
3363 | ||
3364 | void | |
52dc7ee6 | 3365 | ospf_ls_upd_send (struct ospf_neighbor *nbr, struct list *update, int flag) |
718e3744 | 3366 | { |
3367 | struct ospf_interface *oi; | |
1eb8ef25 | 3368 | struct ospf_lsa *lsa; |
718e3744 | 3369 | struct prefix_ipv4 p; |
3370 | struct route_node *rn; | |
1eb8ef25 | 3371 | struct listnode *node; |
718e3744 | 3372 | |
3373 | oi = nbr->oi; | |
3374 | ||
3375 | p.family = AF_INET; | |
3376 | p.prefixlen = IPV4_MAX_BITLEN; | |
3377 | ||
3378 | /* Decide destination address. */ | |
3379 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3380 | p.prefix = oi->vl_data->peer_addr; | |
3381 | else if (flag == OSPF_SEND_PACKET_DIRECT) | |
3382 | p.prefix = nbr->address.u.prefix4; | |
3383 | else if (oi->state == ISM_DR || oi->state == ISM_Backup) | |
3384 | p.prefix.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3385 | else if ((oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3386 | && (flag == OSPF_SEND_PACKET_INDIRECT)) | |
3387 | p.prefix.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
7afa08da | 3388 | else if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT) |
3389 | p.prefix.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
718e3744 | 3390 | else |
3391 | p.prefix.s_addr = htonl (OSPF_ALLDROUTERS); | |
3392 | ||
3393 | if (oi->type == OSPF_IFTYPE_NBMA) | |
3394 | { | |
3395 | if (flag == OSPF_SEND_PACKET_INDIRECT) | |
3396 | zlog_warn ("* LS-Update is directly sent on NBMA network."); | |
3397 | if (IPV4_ADDR_SAME(&oi->address->u.prefix4, &p.prefix.s_addr)) | |
3398 | zlog_warn ("* LS-Update is sent to myself."); | |
3399 | } | |
3400 | ||
3401 | rn = route_node_get (oi->ls_upd_queue, (struct prefix *) &p); | |
3402 | ||
3403 | if (rn->info == NULL) | |
3404 | rn->info = list_new (); | |
3405 | ||
1eb8ef25 | 3406 | for (ALL_LIST_ELEMENTS_RO (update, node, lsa)) |
1fe6ed38 | 3407 | listnode_add (rn->info, ospf_lsa_lock (lsa)); /* oi->ls_upd_queue */ |
718e3744 | 3408 | |
3409 | if (oi->t_ls_upd_event == NULL) | |
3410 | oi->t_ls_upd_event = | |
3411 | thread_add_event (master, ospf_ls_upd_send_queue_event, oi, 0); | |
3412 | } | |
3413 | ||
3414 | static void | |
52dc7ee6 | 3415 | ospf_ls_ack_send_list (struct ospf_interface *oi, struct list *ack, |
3416 | struct in_addr dst) | |
718e3744 | 3417 | { |
3418 | struct ospf_packet *op; | |
3419 | u_int16_t length = OSPF_HEADER_SIZE; | |
3420 | ||
3421 | op = ospf_packet_new (oi->ifp->mtu); | |
3422 | ||
3423 | /* Prepare OSPF common header. */ | |
3424 | ospf_make_header (OSPF_MSG_LS_ACK, oi, op->s); | |
3425 | ||
3426 | /* Prepare OSPF Link State Acknowledgment body. */ | |
3427 | length += ospf_make_ls_ack (oi, ack, op->s); | |
3428 | ||
3429 | /* Fill OSPF header. */ | |
3430 | ospf_fill_header (oi, op->s, length); | |
3431 | ||
3432 | /* Set packet length. */ | |
3433 | op->length = length; | |
3434 | ||
3435 | /* Set destination IP address. */ | |
3436 | op->dst = dst; | |
3437 | ||
3438 | /* Add packet to the interface output queue. */ | |
3439 | ospf_packet_add (oi, op); | |
3440 | ||
3441 | /* Hook thread to write packet. */ | |
020709f9 | 3442 | OSPF_ISM_WRITE_ON (oi->ospf); |
718e3744 | 3443 | } |
3444 | ||
3445 | static int | |
3446 | ospf_ls_ack_send_event (struct thread *thread) | |
3447 | { | |
3448 | struct ospf_interface *oi = THREAD_ARG (thread); | |
3449 | ||
3450 | oi->t_ls_ack_direct = NULL; | |
3451 | ||
3452 | while (listcount (oi->ls_ack_direct.ls_ack)) | |
3453 | ospf_ls_ack_send_list (oi, oi->ls_ack_direct.ls_ack, | |
3454 | oi->ls_ack_direct.dst); | |
3455 | ||
3456 | return 0; | |
3457 | } | |
3458 | ||
3459 | void | |
3460 | ospf_ls_ack_send (struct ospf_neighbor *nbr, struct ospf_lsa *lsa) | |
3461 | { | |
3462 | struct ospf_interface *oi = nbr->oi; | |
3463 | ||
3464 | if (listcount (oi->ls_ack_direct.ls_ack) == 0) | |
3465 | oi->ls_ack_direct.dst = nbr->address.u.prefix4; | |
3466 | ||
3467 | listnode_add (oi->ls_ack_direct.ls_ack, ospf_lsa_lock (lsa)); | |
3468 | ||
3469 | if (oi->t_ls_ack_direct == NULL) | |
3470 | oi->t_ls_ack_direct = | |
3471 | thread_add_event (master, ospf_ls_ack_send_event, oi, 0); | |
3472 | } | |
3473 | ||
3474 | /* Send Link State Acknowledgment delayed. */ | |
3475 | void | |
3476 | ospf_ls_ack_send_delayed (struct ospf_interface *oi) | |
3477 | { | |
3478 | struct in_addr dst; | |
3479 | ||
3480 | /* Decide destination address. */ | |
3481 | /* RFC2328 Section 13.5 On non-broadcast | |
3482 | networks, delayed Link State Acknowledgment packets must be | |
3483 | unicast separately over each adjacency (i.e., neighbor whose | |
3484 | state is >= Exchange). */ | |
3485 | if (oi->type == OSPF_IFTYPE_NBMA) | |
3486 | { | |
3487 | struct ospf_neighbor *nbr; | |
3488 | struct route_node *rn; | |
3489 | ||
3490 | for (rn = route_top (oi->nbrs); rn; rn = route_next (rn)) | |
3491 | if ((nbr = rn->info) != NULL) | |
3492 | if (nbr != oi->nbr_self && nbr->state >= NSM_Exchange) | |
3493 | while (listcount (oi->ls_ack)) | |
3494 | ospf_ls_ack_send_list (oi, oi->ls_ack, nbr->address.u.prefix4); | |
3495 | return; | |
3496 | } | |
3497 | if (oi->type == OSPF_IFTYPE_VIRTUALLINK) | |
3498 | dst.s_addr = oi->vl_data->peer_addr.s_addr; | |
3499 | else if (oi->state == ISM_DR || oi->state == ISM_Backup) | |
3500 | dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
3501 | else if (oi->type == OSPF_IFTYPE_POINTOPOINT) | |
3502 | dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
630e4807 | 3503 | else if (oi->type == OSPF_IFTYPE_POINTOMULTIPOINT) |
3504 | dst.s_addr = htonl (OSPF_ALLSPFROUTERS); | |
718e3744 | 3505 | else |
3506 | dst.s_addr = htonl (OSPF_ALLDROUTERS); | |
3507 | ||
3508 | while (listcount (oi->ls_ack)) | |
3509 | ospf_ls_ack_send_list (oi, oi->ls_ack, dst); | |
3510 | } |